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(2/3)*x+1/3+3/4 = 21/12 // - 21/12
(2/3)*x+1/3+3/4-(21/12) = 0
(2/3)*x+1/3+3/4-7/4 = 0
2/3*x-2/3 = 0 // + 2/3
2/3*x = 2/3 // : 2/3
x = 2/3/2/3
x = 1
x = 1
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