5x+(100-x)=420

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Solution for 5x+(100-x)=420 equation: 



5x+(100-x)=420

We move all terms to the left:

5x+(100-x)-(420)=0

We add all the numbers together, and all the variables

5x+(-1x+100)-420=0

We get rid of parentheses

5x-1x+100-420=0

We add all the numbers together, and all the variables

4x-320=0

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

4x=320

x=320/4

x=80

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