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x in (-oo:+oo)
y = (5/7)*x-12 // - (5/7)*x-12
y-((5/7)*x)+12 = 0
(-5/7)*x+y+12 = 0
y-5/7*x+12 = 0 // - y+12
-5/7*x = -(y+12) // : -5/7
x = (-(y+12))/(-5/7)
x = 7/5*(y+12)
x = 7/5*(y+12)
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