5a-30=7a-70

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Solution for 5a-30=7a-70 equation: 



5a-30=7a-70

We move all terms to the left:

5a-30-(7a-70)=0

We get rid of parentheses

5a-7a+70-30=0

We add all the numbers together, and all the variables

-2a+40=0

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

-2a=-40

a=-40/-2

a=+20

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