If statement fails to define variable unless shorthand is used (javascript)

I am attempting to define a variable x which will serve to check the location along the x-axis of a moving dot in a circular display, and replot it if it is outside of an allowed radius. It worked when only specified to one direction using just the line:

let x = ((this.state.centerx[point] + frame * this.props.jump) < (0.5 * this.props.width - 0.15 * this.props.width)) ?
(this.state.centerx[point] + frame * this.props.jump) + (0.3 * this.props.width) : this.state.centerx[point] + frame * this.props.jump

however when I attempted to add another check in the form of an if statement I would receive error:

63:20  error    'x' is not defined

Here is the entire code that I am attempting to use:

    for(var frame = 0; frame < this.props.numframes; frame++) {
  var startpoint = (frame % 2 === 0) ? 0 : this.props.numpoints
  for(var point = startpoint; point < startpoint + this.props.numpoints; point++) {
    if(this.state.direction > 0) {
      let x = ((this.state.centerx[point] + frame * this.props.jump) < (0.5 * this.props.width - 0.15 * this.props.width)) ?
      (this.state.centerx[point] + frame * this.props.jump) + (0.3 * this.props.width) : (this.state.centerx[point] + frame * this.props.jump)
    }
    else {
      let x = ((this.state.centerx[point] + frame * this.props.jump) > (0.5 * this.props.width + 0.15 * this.props.width)) ?
      (this.state.centerx[point] + frame * this.props.jump) - (0.3 * this.props.width) : (this.state.centerx[point] + frame * this.props.jump)
    }

Thank you for any insight you may be able to provide.