3x+4x=2100

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Solution for 3x+4x=2100 equation: 



3x+4x=2100

We move all terms to the left:

3x+4x-(2100)=0

We add all the numbers together, and all the variables

7x-2100=0

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

7x=2100

x=2100/7

x=300

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