-2a+7=21

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Solution for -2a+7=21 equation: 



-2a+7=21

We move all terms to the left:

-2a+7-(21)=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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