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(4*x)/5+(6*x)/10 = -12 // + 12
(4*x)/5+(6*x)/10+12 = 0
7/5*x+12 = 0 // - 12
7/5*x = -12 // : 7/5
x = -12/7/5
x = -60/7
x = -60/7
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