(100+x)-(100+x)*0.20=30

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Solution for (100+x)-(100+x)*0.20=30 equation: 



(100+x)-(100+x)*0.20=30

We move all terms to the left:

(100+x)-(100+x)*0.20-(30)=0

We add all the numbers together, and all the variables

(x+100)-(x+100)*0.20-30=0

We multiply parentheses

(x+100)-0.2x-20-30=0

We get rid of parentheses

x-0.2x+100-20-30=0

We add all the numbers together, and all the variables

0.8x+50=0

We move all terms containing x to the left, all other terms to the right

0.8x=-50

x=-50/0.8

x=-62+0.4/0.8

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