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x in (-oo:+oo)
Y = (1/3)*x-7 // - (1/3)*x-7
Y-((1/3)*x)+7 = 0
Y+(-1/3)*x+7 = 0
Y-1/3*x+7 = 0 // - Y+7
-1/3*x = -(Y+7) // : -1/3
x = (-(Y+7))/(-1/3)
x = 3*(Y+7)
x = 3*(Y+7)
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