3X+7x+5x=300

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Solution for 3X+7x+5x=300 equation: 



3X+7X+5X=300

We move all terms to the left:

3X+7X+5X-(300)=0

We add all the numbers together, and all the variables

15X-300=0

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

15X=300

X=300/15

X=20

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