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x in (-oo:+oo)
3*x+7/4 = x-8 // - x-8
3*x-x+7/4+8 = 0
2*x+39/4 = 0 // - 39/4
2*x = -39/4 // : 2
x = -39/4/2
x = -39/8
x = -39/8
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