2x+21=4x-51

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Solution for 2x+21=4x-51 equation: 



2x+21=4x-51

We move all terms to the left:

2x+21-(4x-51)=0

We get rid of parentheses

2x-4x+51+21=0

We add all the numbers together, and all the variables

-2x+72=0

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

-2x=-72

x=-72/-2

x=+36

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