2(21-x)+2x=42

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Solution for 2(21-x)+2x=42 equation: 



2(21-x)+2x=42

We move all terms to the left:

2(21-x)+2x-(42)=0

We add all the numbers together, and all the variables

2(-1x+21)+2x-42=0

We add all the numbers together, and all the variables

2x+2(-1x+21)-42=0

We multiply parentheses

2x-2x+42-42=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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