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(1/2)*x+2*x+x+3+6 = 15 // - 15
(1/2)*x+2*x+x-15+3+6 = 0
7/2*x-6 = 0 // + 6
7/2*x = 6 // : 7/2
x = 6/7/2
x = 12/7
x = 12/7
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