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x in (-oo:+oo)
y = (1/5)*x-7 // - (1/5)*x-7
y-((1/5)*x)+7 = 0
(-1/5)*x+y+7 = 0
y-1/5*x+7 = 0 // - y+7
-1/5*x = -(y+7) // : -1/5
x = (-(y+7))/(-1/5)
x = 5*(y+7)
x = 5*(y+7)
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