21-7a=35

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Solution for 21-7a=35 equation: 



21-7a=35

We move all terms to the left:

21-7a-(35)=0

We add all the numbers together, and all the variables

-7a-14=0

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

-7a=14

a=14/-7

a=-2

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