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(1/7)*x-(8/9) = -289/315 // + -289/315
(1/7)*x-(8/9)-(-289/315) = 0
(1/7)*x-8/9+289/315 = 0
1/7*x+1/35 = 0 // - 1/35
1/7*x = -1/35 // : 1/7
x = -1/35/1/7
x = -1/5
x = -1/5
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