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3*x-(4*x)-(10/2) = 7-(5*x) // - 7-(5*x)
3*x-(4*x)+5*x-(10/2)-7 = 0
3*x-4*x+5*x-7-5 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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