-4a+45=21

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Solution for -4a+45=21 equation: 



-4a+45=21

We move all terms to the left:

-4a+45-(21)=0

We add all the numbers together, and all the variables

-4a+24=0

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

-4a=-24

a=-24/-4

a=+6

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