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x in (-oo:+oo)
y = (8/9)*x+4/7 // - (8/9)*x+4/7
y-((8/9)*x)-(4/7) = 0
(-8/9)*x+y-4/7 = 0
y-8/9*x-4/7 = 0 // - y-4/7
-8/9*x = -(y-4/7) // : -8/9
x = (-(y-4/7))/(-8/9)
x = -9/8*(4/7-y)
x = -9/8*(4/7-y)
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