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(1*3*x)/2 = 6 // - 6
(1*3*x)/2-6 = 0
(3*x)/2-6 = 0
3/2*x-6 = 0 // + 6
3/2*x = 6 // : 3/2
x = 6/3/2
x = 4
x = 4
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