Solving equation x-20% X * 60% = x-140

x-0.2x*0.6=x-140
x-0.12x=x-140
0.88x=x-140
0.12x=140
X = 3500 / 3

(60 * 3 / 20 + x) / (60 + x) = 25% to solve the equation

X=8
The reason is that the equation is reduced to 9 + x = 1 / 4 (60 + x), and then to 9 + x = 15 + 1 / 4x, and then to 3 / 4x = 6, so x = 8

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