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x in (-oo:+oo)
y = (5/3)*x-7 // - (5/3)*x-7
y-((5/3)*x)+7 = 0
(-5/3)*x+y+7 = 0
y-5/3*x+7 = 0 // - y+7
-5/3*x = -(y+7) // : -5/3
x = (-(y+7))/(-5/3)
x = 3/5*(y+7)
x = 3/5*(y+7)
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