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x in (-oo:+oo)
x+3*x-(4/2) = 5 // - 5
x+3*x-(4/2)-5 = 0
x+3*x-5-2 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x = 7/4
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