7a+(90-a)=210

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Solution for 7a+(90-a)=210 equation: 



7a+(90-a)=210

We move all terms to the left:

7a+(90-a)-(210)=0

We add all the numbers together, and all the variables

7a+(-1a+90)-210=0

We get rid of parentheses

7a-1a+90-210=0

We add all the numbers together, and all the variables

6a-120=0

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

6a=120

a=120/6

a=20

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