3x+15=21+1x

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Solution for 3x+15=21+1x equation: 



3x+15=21+1x

We move all terms to the left:

3x+15-(21+1x)=0

We add all the numbers together, and all the variables

3x-(x+21)+15=0

We get rid of parentheses

3x-x-21+15=0

We add all the numbers together, and all the variables

2x-6=0

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

2x=6

x=6/2

x=3

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