4x+21=2x-15

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Solution for 4x+21=2x-15 equation: 



4x+21=2x-15

We move all terms to the left:

4x+21-(2x-15)=0

We get rid of parentheses

4x-2x+15+21=0

We add all the numbers together, and all the variables

2x+36=0

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

2x=-36

x=-36/2

x=-18

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