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9*x = 4/5-7 // - 4/5-7
9*x-(4/5)+7 = 0
9*x-4/5+7 = 0
9*x+31/5 = 0 // - 31/5
9*x = -31/5 // : 9
x = -31/5/9
x = -31/45
x = -31/45
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