\frac { 500 \times 8 \% + x } { 500 + x } = 20 \%
Solve for x
x=75
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100\left(500\times \frac{8}{100}+x\right)=\left(x+500\right)\times 20
Variable x cannot be equal to -500 since division by zero is not defined. Multiply both sides of the equation by 100\left(x+500\right), the least common multiple of 500+x,100.
100\left(500\times \frac{2}{25}+x\right)=\left(x+500\right)\times 20
Reduce the fraction \frac{8}{100} to lowest terms by extracting and canceling out 4.
100\left(40+x\right)=\left(x+500\right)\times 20
Multiply 500 and \frac{2}{25} to get 40.
4000+100x=\left(x+500\right)\times 20
Use the distributive property to multiply 100 by 40+x.
4000+100x=20x+10000
Use the distributive property to multiply x+500 by 20.
4000+100x-20x=10000
Subtract 20x from both sides.
4000+80x=10000
Combine 100x and -20x to get 80x.
80x=10000-4000
Subtract 4000 from both sides.
80x=6000
Subtract 4000 from 10000 to get 6000.
x=\frac{6000}{80}
Divide both sides by 80.
x=75
Divide 6000 by 80 to get 75.
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