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x in (-oo:+oo)
y = (4/5)*x+7 // - (4/5)*x+7
y-((4/5)*x)-7 = 0
(-4/5)*x+y-7 = 0
y-4/5*x-7 = 0 // - y-7
-4/5*x = -(y-7) // : -4/5
x = (-(y-7))/(-4/5)
x = -5/4*(7-y)
x = -5/4*(7-y)
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