130=10a-20

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Solution for 130=10a-20 equation: 



130=10a-20

We move all terms to the left:

130-(10a-20)=0

We get rid of parentheses

-10a+20+130=0

We add all the numbers together, and all the variables

-10a+150=0

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

-10a=-150

a=-150/-10

a=+15

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