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(1/2)*x+1/4 = 2*(2/3)*x-5 // - 2*(2/3)*x-5
(1/2)*x-(2*(2/3)*x)+1/4+5 = 0
(1/2)*x+(-4/3)*x+1/4+5 = 0
21/4-5/6*x = 0 // - 21/4
-5/6*x = -21/4 // : -5/6
x = -21/4/(-5/6)
x = 63/10
x = 63/10
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