7(2a+3)+21=140

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Solution for 7(2a+3)+21=140 equation: 



7(2a+3)+21=140

We move all terms to the left:

7(2a+3)+21-(140)=0

We add all the numbers together, and all the variables

7(2a+3)-119=0

We multiply parentheses

14a+21-119=0

We add all the numbers together, and all the variables

14a-98=0

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

14a=98

a=98/14

a=7

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