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