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3*x+2*x+1/2 = 61/2 // - 61/2
3*x+2*x+1/2-(61/2) = 0
3*x+2*x+1/2-61/2 = 0
5*x-30 = 0 // + 30
5*x = 30 // : 5
x = 30/5
x = 6
x = 6
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