7a-3=21+12

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Solution for 7a-3=21+12 equation: 



7a-3=21+12

We move all terms to the left:

7a-3-(21+12)=0

We add all the numbers together, and all the variables

7a-3-33=0

We add all the numbers together, and all the variables

7a-36=0

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

7a=36

a=36/7

a=5+1/7

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