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X/2+4*x = x/4-64 // - x/4-64
X/2+4*x-(x/4)+64 = 0
1/2*X+15/4*x+64 = 0 // - 1/2*X+64
15/4*x = -(1/2*X+64) // : 15/4
x = (-(1/2*X+64))/15/4
x = -4/15*(1/2*X+64)
x = -4/15*(1/2*X+64)
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