12-3x=21-5x

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Solution for 12-3x=21-5x equation: 



12-3x=21-5x

We move all terms to the left:

12-3x-(21-5x)=0

We add all the numbers together, and all the variables

-3x-(-5x+21)+12=0

We get rid of parentheses

-3x+5x-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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