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6-(3*x) = (1/4)*x // - (1/4)*x
6-(3*x)-((1/4)*x) = 0
(-1/4)*x-3*x+6 = 0
6-13/4*x = 0 // - 6
-13/4*x = -6 // : -13/4
x = -6/(-13/4)
x = 24/13
x = 24/13
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