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x in (-oo:+oo)
y = (7/8)*(x-3)-9 // - (7/8)*(x-3)-9
y-((7/8)*(x-3))+9 = 0
(-7/8)*(x-3)+y+9 = 0
y-7/8*(x-3)+9 = 0
y-7/8*(x-3)+9 = 0
y-7/8*x+21/8+9 = 0
y-7/8*x+93/8 = 0
y-7/8*x+93/8 = 0
y-7/8*x+93/8 = 0 // - y+93/8
-7/8*x = -(y+93/8) // : -7/8
x = (-(y+93/8))/(-7/8)
x = 8/7*(y+93/8)
x = 8/7*(y+93/8)
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