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(-2/7)*x+(2/3)*x+1 = 31/7 // - 31/7
(-2/7)*x+(2/3)*x-(31/7)+1 = 0
(-2/7)*x+(2/3)*x-31/7+1 = 0
8/21*x-24/7 = 0 // + 24/7
8/21*x = 24/7 // : 8/21
x = 24/7/8/21
x = 9
x = 9
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