3x+21=-2x+66

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Solution for 3x+21=-2x+66 equation: 



3x+21=-2x+66

We move all terms to the left:

3x+21-(-2x+66)=0

We get rid of parentheses

3x+2x-66+21=0

We add all the numbers together, and all the variables

5x-45=0

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

5x=45

x=45/5

x=9

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