6+(-21)+2x=x-3

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Solution for 6+(-21)+2x=x-3 equation: 



6+(-21)+2x=x-3

We move all terms to the left:

6+(-21)+2x-(x-3)=0

We add all the numbers together, and all the variables

2x-(x-3)-15=0

We get rid of parentheses

2x-x+3-15=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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