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x in (-oo:+oo)
y-80 = (-24/4)*(x-10) // - (-24/4)*(x-10)
y-((-24/4)*(x-10))-80 = 0
6*(x-10)+y-80 = 0
6*(x-10)+y-80 = 0
6*x+y-80-60 = 0
6*x+y-140 = 0
6*x+y-140 = 0
6*x+y-140 = 0 // - y-140
6*x = -(y-140) // : 6
x = (-(y-140))/6
x = (140-y)/6
x = (140-y)/6
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