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(5/7)*x-(2/3) = -29/21 // + -29/21
(5/7)*x-(2/3)-(-29/21) = 0
(5/7)*x-2/3+29/21 = 0
5/7*x+5/7 = 0 // - 5/7
5/7*x = -5/7 // : 5/7
x = -5/7/5/7
x = -1
x = -1
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