12x+12+21=14x+15

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Solution for 12x+12+21=14x+15 equation: 



12x+12+21=14x+15

We move all terms to the left:

12x+12+21-(14x+15)=0

We add all the numbers together, and all the variables

12x-(14x+15)+33=0

We get rid of parentheses

12x-14x-15+33=0

We add all the numbers together, and all the variables

-2x+18=0

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

-2x=-18

x=-18/-2

x=+9

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