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(6/7)*x-4/9 = -58/9 // + -58/9
(6/7)*x-4/9-(-58/9) = 0
(6/7)*x-4/9+58/9 = 0
6/7*x+6 = 0 // - 6
6/7*x = -6 // : 6/7
x = -6/6/7
x = -7
x = -7
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