3x+11=7x-21

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Solution for 3x+11=7x-21 equation: 



3x+11=7x-21

We move all terms to the left:

3x+11-(7x-21)=0

We get rid of parentheses

3x-7x+21+11=0

We add all the numbers together, and all the variables

-4x+32=0

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

-4x=-32

x=-32/-4

x=+8

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