3x+7x=142-12

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Solution for 3x+7x=142-12 equation: 



3x+7x=142-12

We move all terms to the left:

3x+7x-(142-12)=0

We add all the numbers together, and all the variables

3x+7x-130=0

We add all the numbers together, and all the variables

10x-130=0

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

10x=130

x=130/10

x=13

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