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(1/2)*(x-3)+x = 3*(4-x)+17 // - 3*(4-x)+17
(1/2)*(x-3)-(3*(4-x))+x-17 = 0
(1/2)*(x-3)-3*(4-x)+x-17 = 0
1/2*(x-3)-3*(4-x)+x-17 = 0
1/2*(x-3)-3*(4-x)+x-17 = 0
7/2*x+x-17-27/2 = 0
9/2*x-17-27/2 = 0
9/2*x-61/2 = 0
9/2*x-61/2 = 0
9/2*x-61/2 = 0 // + 61/2
9/2*x = 61/2 // : 9/2
x = 61/2/9/2
x = 61/9
x = 61/9
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