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(12/7)*x-((1/21)*x) = -8/3 // + -8/3
(12/7)*x-((1/21)*x)-(-8/3) = 0
(12/7)*x+(-1/21)*x+8/3 = 0
5/3*x+8/3 = 0 // - 8/3
5/3*x = -8/3 // : 5/3
x = -8/3/5/3
x = -8/5
x = -8/5
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