x-15=-3x

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Solution for x-15=-3x equation: 



x-15=-3x

We move all terms to the left:

x-15-(-3x)=0

We get rid of parentheses

x+3x-15=0

We add all the numbers together, and all the variables

4x-15=0

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

4x=15

x=15/4

x=3+3/4

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