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