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x in (-oo:+oo)
y = (5/8)*x+7 // - (5/8)*x+7
y-((5/8)*x)-7 = 0
(-5/8)*x+y-7 = 0
y-5/8*x-7 = 0 // - y-7
-5/8*x = -(y-7) // : -5/8
x = (-(y-7))/(-5/8)
x = -8/5*(7-y)
x = -8/5*(7-y)
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