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3*x-(1/2) = 10 // - 10
3*x-(1/2)-10 = 0
3*x-1/2-10 = 0
3*x-21/2 = 0 // + 21/2
3*x = 21/2 // : 3
x = 21/2/3
x = 7/2
x = 7/2
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