2x+3x+9+x=87

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Solution for 2x+3x+9+x=87 equation: 



2x+3x+9+x=87

We move all terms to the left:

2x+3x+9+x-(87)=0

We add all the numbers together, and all the variables

6x-78=0

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

6x=78

x=78/6

x=13

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