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x in (-oo:+oo)
y-7 = (-1/8)*(x-3) // - (-1/8)*(x-3)
y-((-1/8)*(x-3))-7 = 0
(1/8)*(x-3)+y-7 = 0
1/8*(x-3)+y-7 = 0
1/8*(x-3)+y-7 = 0
1/8*x+y-7-3/8 = 0
1/8*x+y-59/8 = 0
1/8*x+y-59/8 = 0
1/8*x+y-59/8 = 0 // - y-59/8
1/8*x = -(y-59/8) // : 1/8
x = (-(y-59/8))/1/8
x = 8*(59/8-y)
x = 8*(59/8-y)
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