-42=2a-5a+3

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Solution for -42=2a-5a+3 equation: 



-42=2a-5a+3

We move all terms to the left:

-42-(2a-5a+3)=0

We add all the numbers together, and all the variables

-(-3a+3)-42=0

We get rid of parentheses

3a-3-42=0

We add all the numbers together, and all the variables

3a-45=0

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

3a=45

a=45/3

a=15

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