6+15x=21+12x

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Solution for 6+15x=21+12x equation: 



6+15x=21+12x

We move all terms to the left:

6+15x-(21+12x)=0

We add all the numbers together, and all the variables

15x-(12x+21)+6=0

We get rid of parentheses

15x-12x-21+6=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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