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X/2 = 48-(x/4) // - 48-(x/4)
X/2+x/4-48 = 0
1/2*X+1/4*x-48 = 0 // - 1/2*X-48
1/4*x = -(1/2*X-48) // : 1/4
x = (-(1/2*X-48))/1/4
x = 4*(48-(1/2*X))
x = 4*(48-(1/2*X))
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