7x-21=5x+87

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Solution for 7x-21=5x+87 equation: 



7x-21=5x+87

We move all terms to the left:

7x-21-(5x+87)=0

We get rid of parentheses

7x-5x-87-21=0

We add all the numbers together, and all the variables

2x-108=0

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

2x=108

x=108/2

x=54

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