5a+4(3a+7)=21

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Solution for 5a+4(3a+7)=21 equation: 



5a+4(3a+7)=21

We move all terms to the left:

5a+4(3a+7)-(21)=0

We multiply parentheses

5a+12a+28-21=0

We add all the numbers together, and all the variables

17a+7=0

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

17a=-7

a=-7/17

a=-7/17

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