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15/5 = 6*x-7*2*x // - 6*x-7*2*x
15/5-(6*x)-(-7*2*x) = 0
14*x-6*x+15/5 = 0
8*x+3 = 0 // - 3
8*x = -3 // : 8
x = -3/8
x = -3/8
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