40=8+4a

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Solution for 40=8+4a equation: 



40=8+4a

We move all terms to the left:

40-(8+4a)=0

We add all the numbers together, and all the variables

-(4a+8)+40=0

We get rid of parentheses

-4a-8+40=0

We add all the numbers together, and all the variables

-4a+32=0

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

-4a=-32

a=-32/-4

a=+8

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