4x+12=2x+21

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Solution for 4x+12=2x+21 equation: 



4x+12=2x+21

We move all terms to the left:

4x+12-(2x+21)=0

We get rid of parentheses

4x-2x-21+12=0

We add all the numbers together, and all the variables

2x-9=0

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

2x=9

x=9/2

x=4+1/2

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