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x in (-oo:+oo)
3*x-((1/2)*x) = 6 // - 6
3*x-((1/2)*x)-6 = 0
3*x+(-1/2)*x-6 = 0
5/2*x-6 = 0 // + 6
5/2*x = 6 // : 5/2
x = 6/5/2
x = 12/5
x = 12/5
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