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