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x in (-oo:+oo)
(-1/2)*(4*x-7) = -8*x // + -8*x
(-1/2)*(4*x-7)-(-8*x) = 0
(-1/2)*(4*x-7)+8*x = 0
8*x-1/2*(4*x-7) = 0
8*x-1/2*(4*x-7) = 0
6*x+7/2 = 0
6*x+7/2 = 0
6*x+7/2 = 0 // - 7/2
6*x = -7/2 // : 6
x = -7/2/6
x = -7/12
x = -7/12
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