X+21+X+2x-45=180

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Solution for X+21+X+2x-45=180 equation: 



X+21+X+2X-45=180

We move all terms to the left:

X+21+X+2X-45-(180)=0

We add all the numbers together, and all the variables

4X-204=0

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

4X=204

X=204/4

X=51

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