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