15-2x=21-4x

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Solution for 15-2x=21-4x equation: 



15-2x=21-4x

We move all terms to the left:

15-2x-(21-4x)=0

We add all the numbers together, and all the variables

-2x-(-4x+21)+15=0

We get rid of parentheses

-2x+4x-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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