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(-5/7)*x-(4/9) = 29/441 // - 29/441
(-5/7)*x-(4/9)-(29/441) = 0
(-5/7)*x-4/9-29/441 = 0
-5/7*x-25/49 = 0 // + 25/49
-5/7*x = 25/49 // : -5/7
x = 25/49/(-5/7)
x = -5/7
x = -5/7
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