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(-1/2)*x-((-3/6)*x) = (1/12)*x // - (1/12)*x
(-1/2)*x-((-3/6)*x)-((1/12)*x) = 0
(-1/2)*x+(1/2)*x+(-1/12)*x = 0
-1/12*x = 0 // : -1/12
x = 0
x = 0
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