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45/5 = 6*x-7*2*x // - 6*x-7*2*x
45/5-(6*x)-(-7*2*x) = 0
14*x-6*x+45/5 = 0
8*x+9 = 0 // - 9
8*x = -9 // : 8
x = -9/8
x = -9/8
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