6x+13=4x+21

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Solution for 6x+13=4x+21 equation: 



6x+13=4x+21

We move all terms to the left:

6x+13-(4x+21)=0

We get rid of parentheses

6x-4x-21+13=0

We add all the numbers together, and all the variables

2x-8=0

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

2x=8

x=8/2

x=4

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