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(1/3)*x-((7/12)*x) = 2/3 // - 2/3
(1/3)*x-((7/12)*x)-(2/3) = 0
(1/3)*x+(-7/12)*x-2/3 = 0
-1/4*x-2/3 = 0 // + 2/3
-1/4*x = 2/3 // : -1/4
x = 2/3/(-1/4)
x = -8/3
x = -8/3
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