3x+4=21x=7

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Solution for 3x+4=21x=7 equation: 



3x+4=21x=7

We move all terms to the left:

3x+4-(21x)=0

We add all the numbers together, and all the variables

-18x+4=0

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

-18x=-4

x=-4/-18

x=2/9

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