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x in (-oo:+oo)
x+3*x+(1/2)*x+2 = 29 // - 29
x+3*x+(1/2)*x-29+2 = 0
9/2*x-27 = 0 // + 27
9/2*x = 27 // : 9/2
x = 27/9/2
x = 6
x = 6
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