5x+21=13+3x

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Solution for 5x+21=13+3x equation: 



5x+21=13+3x

We move all terms to the left:

5x+21-(13+3x)=0

We add all the numbers together, and all the variables

5x-(3x+13)+21=0

We get rid of parentheses

5x-3x-13+21=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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