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(1/7)*x+1/3 = (-6/7)*x // - (-6/7)*x
(1/7)*x-((-6/7)*x)+1/3 = 0
(1/7)*x+(6/7)*x+1/3 = 0
x+1/3 = 0 // - 1/3
x = -1/3
x = -1/3
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