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x in (-oo:+oo)
Y-7 = (1/15)*(x-80) // - (1/15)*(x-80)
Y-((1/15)*(x-80))-7 = 0
(-1/15)*(x-80)+Y-7 = 0
Y-1/15*(x-80)-7 = 0
Y-1/15*(x-80)-7 = 0
Y-1/15*x-7+16/3 = 0
Y-1/15*x-5/3 = 0
Y-1/15*x-5/3 = 0
Y-1/15*x-5/3 = 0 // - Y-5/3
-1/15*x = -(Y-5/3) // : -1/15
x = (-(Y-5/3))/(-1/15)
x = -15*(5/3-Y)
x = -15*(5/3-Y)
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