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x in (-oo:+oo)
Y = (-1/2)*x-7 // - (-1/2)*x-7
Y-((-1/2)*x)+7 = 0
Y+(1/2)*x+7 = 0
Y+1/2*x+7 = 0 // - Y+7
1/2*x = -(Y+7) // : 1/2
x = (-(Y+7))/1/2
x = -2*(Y+7)
x = -2*(Y+7)
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