x+x+6+x+12=87

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Solution for x+x+6+x+12=87 equation: 



x+x+6+x+12=87

We move all terms to the left:

x+x+6+x+12-(87)=0

We add all the numbers together, and all the variables

3x-69=0

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

3x=69

x=69/3

x=23

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