18=-a+3

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Solution for 18=-a+3 equation: 



18=-a+3

We move all terms to the left:

18-(-a+3)=0

We add all the numbers together, and all the variables

-(-1a+3)+18=0

We get rid of parentheses

1a-3+18=0

We add all the numbers together, and all the variables

a+15=0

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

a=-15

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