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7*x-8 = -18/11 // + -18/11
7*x-(-18/11)-8 = 0
7*x+18/11-8 = 0
7*x-70/11 = 0 // + 70/11
7*x = 70/11 // : 7
x = 70/11/7
x = 10/11
x = 10/11
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