15+3x=-4x-20

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Solution for 15+3x=-4x-20 equation: 



15+3x=-4x-20

We move all terms to the left:

15+3x-(-4x-20)=0

We get rid of parentheses

3x+4x+20+15=0

We add all the numbers together, and all the variables

7x+35=0

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

7x=-35

x=-35/7

x=-5

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