Solve for x
x=25000000
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x-x\times 0.2=20000000
Subtract x\times 0.2 from both sides.
0.8x=20000000
Combine x and -x\times 0.2 to get 0.8x.
x=\frac{20000000}{0.8}
Divide both sides by 0.8.
x=\frac{200000000}{8}
Expand \frac{20000000}{0.8} by multiplying both numerator and the denominator by 10.
x=25000000
Divide 200000000 by 8 to get 25000000.
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