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(3/7)*x-7/9 = -76/63 // + -76/63
(3/7)*x-7/9-(-76/63) = 0
(3/7)*x-7/9+76/63 = 0
3/7*x+3/7 = 0 // - 3/7
3/7*x = -3/7 // : 3/7
x = -3/7/3/7
x = -1
x = -1
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