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x in (-oo:+oo)
y = (3/13)*x+9/8 // - (3/13)*x+9/8
y-((3/13)*x)-(9/8) = 0
(-3/13)*x+y-9/8 = 0
y-3/13*x-9/8 = 0 // - y-9/8
-3/13*x = -(y-9/8) // : -3/13
x = (-(y-9/8))/(-3/13)
x = -13/3*(9/8-y)
x = -13/3*(9/8-y)
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