6+9x=4+21x

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Solution for 6+9x=4+21x equation: 



6+9x=4+21x

We move all terms to the left:

6+9x-(4+21x)=0

We add all the numbers together, and all the variables

9x-(21x+4)+6=0

We get rid of parentheses

9x-21x-4+6=0

We add all the numbers together, and all the variables

-12x+2=0

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

-12x=-2

x=-2/-12

x=1/6

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