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