3x+5x+7x=300

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



3x+5x+7x=300

We move all terms to the left:

3x+5x+7x-(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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