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(1/3)*(6-x) = 1/4 // - 1/4
(1/3)*(6-x)-(1/4) = 0
(1/3)*(6-x)-1/4 = 0
1/3*(6-x)-1/4 = 0
(1/3*4*(6-x))/4-1/4 = 0
1/3*4*(6-x)-1 = 0
7-4/3*x = 0
(7-4/3*x)/4 = 0
(7-4/3*x)/4 = 0 // * 4
7-4/3*x = 0
7-4/3*x = 0 // - 7
-4/3*x = -7 // : -4/3
x = -7/(-4/3)
x = 21/4
x = 21/4
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