21a-63=4

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Solution for 21a-63=4 equation: 



21a-63=4

We move all terms to the left:

21a-63-(4)=0

We add all the numbers together, and all the variables

21a-67=0

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

21a=67

a=67/21

a=3+4/21

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