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7*x+2*x-5 = -91/11 // + -91/11
7*x+2*x-(-91/11)-5 = 0
7*x+2*x+91/11-5 = 0
9*x+36/11 = 0 // - 36/11
9*x = -36/11 // : 9
x = -36/11/9
x = -4/11
x = -4/11
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