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(-2/7)*x+(1/3)*x-12 = 14 // - 14
(-2/7)*x+(1/3)*x-14-12 = 0
1/21*x-26 = 0 // + 26
1/21*x = 26 // : 1/21
x = 26/1/21
x = 546
x = 546
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