9=15+-2x

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Solution for 9=15+-2x equation: 



9=15+-2x

We move all terms to the left:

9-(15+-2x)=0

We add all the numbers together, and all the variables

-(-2x)+9=0

We get rid of parentheses

2x+9=0

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

2x=-9

x=-9/2

x=-4+1/2

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