18=4+2a

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Solution for 18=4+2a equation: 



18=4+2a

We move all terms to the left:

18-(4+2a)=0

We add all the numbers together, and all the variables

-(2a+4)+18=0

We get rid of parentheses

-2a-4+18=0

We add all the numbers together, and all the variables

-2a+14=0

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

-2a=-14

a=-14/-2

a=+7

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