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x in (-oo:+oo)
3*(x/4) = -12*x-102 // + -12*x-102
3*(x/4)-(-12*x)+102 = 0
3*(x/4)+12*x+102 = 0
51/4*x+102 = 0 // - 102
51/4*x = -102 // : 51/4
x = -102/51/4
x = -8
x = -8
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