6x+4=21x+7

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Solution for 6x+4=21x+7 equation: 



6x+4=21x+7

We move all terms to the left:

6x+4-(21x+7)=0

We get rid of parentheses

6x-21x-7+4=0

We add all the numbers together, and all the variables

-15x-3=0

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

-15x=3

x=3/-15

x=-1/5

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