129=2x+9

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Solution for 129=2x+9 equation: 



129=2x+9

We move all terms to the left:

129-(2x+9)=0

We get rid of parentheses

-2x-9+129=0

We add all the numbers together, and all the variables

-2x+120=0

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

-2x=-120

x=-120/-2

x=+60

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