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(-6/7)*x+1 = (-3/84)*x+19/91 // - (-3/84)*x+19/91
(-6/7)*x-((-3/84)*x)-(19/91)+1 = 0
(-6/7)*x+(1/28)*x-19/91+1 = 0
72/91-23/28*x = 0 // - 72/91
-23/28*x = -72/91 // : -23/28
x = -72/91/(-23/28)
x = 288/299
x = 288/299
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