6x+(12-4x)=21

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Solution for 6x+(12-4x)=21 equation: 



6x+(12-4x)=21

We move all terms to the left:

6x+(12-4x)-(21)=0

We add all the numbers together, and all the variables

6x+(-4x+12)-21=0

We get rid of parentheses

6x-4x+12-21=0

We add all the numbers together, and all the variables

2x-9=0

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

2x=9

x=9/2

x=4+1/2

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