100-7a=21

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Solution for 100-7a=21 equation: 



100-7a=21

We move all terms to the left:

100-7a-(21)=0

We add all the numbers together, and all the variables

-7a+79=0

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

-7a=-79

a=-79/-7

a=11+2/7

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