8a+7=a+28+42

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Solution for 8a+7=a+28+42 equation: 



8a+7=a+28+42

We move all terms to the left:

8a+7-(a+28+42)=0

We add all the numbers together, and all the variables

8a-(a+70)+7=0

We get rid of parentheses

8a-a-70+7=0

We add all the numbers together, and all the variables

7a-63=0

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

7a=63

a=63/7

a=9

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