8a+168=7a-21

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Solution for 8a+168=7a-21 equation: 



8a+168=7a-21

We move all terms to the left:

8a+168-(7a-21)=0

We get rid of parentheses

8a-7a+21+168=0

We add all the numbers together, and all the variables

a+189=0

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

a=-189

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