12x-4+12x-4=21x+7

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Solution for 12x-4+12x-4=21x+7 equation: 



12x-4+12x-4=21x+7

We move all terms to the left:

12x-4+12x-4-(21x+7)=0

We add all the numbers together, and all the variables

24x-(21x+7)-8=0

We get rid of parentheses

24x-21x-7-8=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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