3x+15=-7x

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Solution for 3x+15=-7x equation: 



3x+15=-7x

We move all terms to the left:

3x+15-(-7x)=0

We get rid of parentheses

3x+7x+15=0

We add all the numbers together, and all the variables

10x+15=0

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

10x=-15

x=-15/10

x=-1+1/2

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