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