3x+7x=12+28

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Solution for 3x+7x=12+28 equation: 



3x+7x=12+28

We move all terms to the left:

3x+7x-(12+28)=0

We add all the numbers together, and all the variables

3x+7x-40=0

We add all the numbers together, and all the variables

10x-40=0

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

10x=40

x=40/10

x=4

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