7x+66=87

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Solution for 7x+66=87 equation: 



7x+66=87

We move all terms to the left:

7x+66-(87)=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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