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X/12 = x/10-1 // - x/10-1
X/12-(x/10)+1 = 0
1/12*X-1/10*x+1 = 0 // - 1/12*X+1
-1/10*x = -(1/12*X+1) // : -1/10
x = (-(1/12*X+1))/(-1/10)
x = 10*(1/12*X+1)
x = 10*(1/12*X+1)
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