6x-15=-3x+21

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Solution for 6x-15=-3x+21 equation: 



6x-15=-3x+21

We move all terms to the left:

6x-15-(-3x+21)=0

We get rid of parentheses

6x+3x-21-15=0

We add all the numbers together, and all the variables

9x-36=0

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

9x=36

x=36/9

x=4

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