15a-15=21+61

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Solution for 15a-15=21+61 equation: 



15a-15=21+61

We move all terms to the left:

15a-15-(21+61)=0

We add all the numbers together, and all the variables

15a-15-82=0

We add all the numbers together, and all the variables

15a-97=0

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

15a=97

a=97/15

a=6+7/15

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