15+18x=21+15x

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Solution for 15+18x=21+15x equation: 



15+18x=21+15x

We move all terms to the left:

15+18x-(21+15x)=0

We add all the numbers together, and all the variables

18x-(15x+21)+15=0

We get rid of parentheses

18x-15x-21+15=0

We add all the numbers together, and all the variables

3x-6=0

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

3x=6

x=6/3

x=2

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