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x in (-oo:+oo)
y+3 = (7/8)*(x-7) // - (7/8)*(x-7)
y-((7/8)*(x-7))+3 = 0
(-7/8)*(x-7)+y+3 = 0
y-7/8*(x-7)+3 = 0
y-7/8*(x-7)+3 = 0
y-7/8*x+3+49/8 = 0
y-7/8*x+73/8 = 0
y-7/8*x+73/8 = 0
y-7/8*x+73/8 = 0 // - y+73/8
-7/8*x = -(y+73/8) // : -7/8
x = (-(y+73/8))/(-7/8)
x = 8/7*(y+73/8)
x = 8/7*(y+73/8)
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