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x in (-oo:+oo)
3*x = (1/4)*x-7 // - (1/4)*x-7
3*x-((1/4)*x)+7 = 0
3*x+(-1/4)*x+7 = 0
11/4*x+7 = 0 // - 7
11/4*x = -7 // : 11/4
x = -7/11/4
x = -28/11
x = -28/11
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