7(2a=3)=21=100+40

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Solution for 7(2a=3)=21=100+40 equation: 



7(2a=3)=21=100+40

We move all terms to the left:

7(2a-(3))=0

We multiply parentheses

14a-21=0

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

14a=21

a=21/14

a=1+1/2

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