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