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(-5/7)*x+(4/7)*x-2 = -131/63 // + -131/63
(-5/7)*x+(4/7)*x-(-131/63)-2 = 0
(-5/7)*x+(4/7)*x+131/63-2 = 0
5/63-1/7*x = 0 // - 5/63
-1/7*x = -5/63 // : -1/7
x = -5/63/(-1/7)
x = 5/9
x = 5/9
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