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(1/2)*x+3*x+1 = 9/2 // - 9/2
(1/2)*x+3*x-(9/2)+1 = 0
(1/2)*x+3*x-9/2+1 = 0
7/2*x-7/2 = 0 // + 7/2
7/2*x = 7/2 // : 7/2
x = 7/2/7/2
x = 1
x = 1
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