3x+5+4x=5x+21

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Solution for 3x+5+4x=5x+21 equation: 



3x+5+4x=5x+21

We move all terms to the left:

3x+5+4x-(5x+21)=0

We add all the numbers together, and all the variables

7x-(5x+21)+5=0

We get rid of parentheses

7x-5x-21+5=0

We add all the numbers together, and all the variables

2x-16=0

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

2x=16

x=16/2

x=8

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