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2*x+(3/4)*x+3/4 = 31/12 // - 31/12
2*x+(3/4)*x+3/4-(31/12) = 0
2*x+(3/4)*x+3/4-31/12 = 0
11/4*x-11/6 = 0 // + 11/6
11/4*x = 11/6 // : 11/4
x = 11/6/11/4
x = 2/3
x = 2/3
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