why does this not work?

///New Movement Script
//right movement script
if keyboard_check(vk_right) && !keyboard_check(vk_left){
    dir = 1;
    if !steptimer > 0{
        walking = true;
        if hspeed < mhs then hspeed += 0.25 else hspeed = mhs;
    }
    else{
        if steptimer > 0{
            if steptimer = 4{
                if place_free(x+1,y){
                    firststep = true;
                    x+=1;
                }
            }
            steptimer -=1;
        }
    }
}
//left movement script
if keyboard_check(vk_left) && !keyboard_check(vk_right){
    dir = 0;
    if !steptimer > 0{
        walking = true;
        if hspeed > mhs*(-1) then hspeed -= 0.25 else hspeed = mhs*(-1);
    }
    else{
        if steptimer > 0{
            if steptimer = 4{
                if place_free(x-1,y){
                    firststep = true;
                    x-=1;
                }
            }
            steptimer -=1;
        }
    }
}
//if right or left is not currently pressed
if (keyboard_check(vk_right) && keyboard_check(vk_left)) || (!keyboard_check(vk_right) && !keyboard_check(vk_left)){
    walking = false
    if falling = false then firststep = false && steptimer = 4;
    if !hspeed = 0{
        if hspeed > 0.125 then hspeed -= 0.125;
        if hspeed < -0.125 then hspeed += 0.125;
        if hspeed <= 0.125 && hspeed >= -0.125 then hspeed = 0;
    }
}