42=a+17

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Solution for 42=a+17 equation: 



42=a+17

We move all terms to the left:

42-(a+17)=0

We get rid of parentheses

-a-17+42=0

We add all the numbers together, and all the variables

-1a+25=0

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

-a=-25

a=-25/-1

a=+25

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