15x+100=-5x

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Solution for 15x+100=-5x equation: 



15x+100=-5x

We move all terms to the left:

15x+100-(-5x)=0

We get rid of parentheses

15x+5x+100=0

We add all the numbers together, and all the variables

20x+100=0

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

20x=-100

x=-100/20

x=-5

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