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3-(0.25*x) = (-1/2)*x+9 // - (-1/2)*x+9
3-(0.25*x)-((-1/2)*x)-9 = 0
(1/2)*x-0.25*x-9+3 = 0
0.25*x-6 = 0 // + 6
0.25*x = 6 // : 0.25
x = 6/0.25
x = 24
x = 24
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