100=4a+20+4a+40

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Solution for 100=4a+20+4a+40 equation: 



100=4a+20+4a+40

We move all terms to the left:

100-(4a+20+4a+40)=0

We add all the numbers together, and all the variables

-(8a+60)+100=0

We get rid of parentheses

-8a-60+100=0

We add all the numbers together, and all the variables

-8a+40=0

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

-8a=-40

a=-40/-8

a=+5

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