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7/12 = -x/4 // + -x/4
7/12-(-x/4) = 0
(1/4)*x+7/12 = 0
1/4*x+7/12 = 0 // - 7/12
1/4*x = -7/12 // : 1/4
x = -7/12/1/4
x = -7/3
x = -7/3
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