55=15-2x

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Solution for 55=15-2x equation: 



55=15-2x

We move all terms to the left:

55-(15-2x)=0

We add all the numbers together, and all the variables

-(-2x+15)+55=0

We get rid of parentheses

2x-15+55=0

We add all the numbers together, and all the variables

2x+40=0

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

2x=-40

x=-40/2

x=-20

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