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(2/3)*x+3/4 = 7/12 // - 7/12
(2/3)*x+3/4-(7/12) = 0
(2/3)*x+3/4-7/12 = 0
2/3*x+1/6 = 0 // - 1/6
2/3*x = -1/6 // : 2/3
x = -1/6/2/3
x = -1/4
x = -1/4
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