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X/4 = x/5-12 // - x/5-12
X/4-(x/5)+12 = 0
1/4*X-1/5*x+12 = 0 // - 1/4*X+12
-1/5*x = -(1/4*X+12) // : -1/5
x = (-(1/4*X+12))/(-1/5)
x = 5*(1/4*X+12)
x = 5*(1/4*X+12)
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