(21a+9)7=210

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Solution for (21a+9)7=210 equation: 



(21a+9)7=210

We move all terms to the left:

(21a+9)7-(210)=0

We multiply parentheses

147a+63-210=0

We add all the numbers together, and all the variables

147a-147=0

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

147a=147

a=147/147

a=1

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