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(3*x)/2+9/5 = 12 // - 12
(3*x)/2+9/5-12 = 0
3/2*x-51/5 = 0 // + 51/5
3/2*x = 51/5 // : 3/2
x = 51/5/3/2
x = 34/5
x = 34/5
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