x+4x+7x=142

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Solution for x+4x+7x=142 equation: 



x+4x+7x=142

We move all terms to the left:

x+4x+7x-(142)=0

We add all the numbers together, and all the variables

12x-142=0

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

12x=142

x=142/12

x=11+5/6

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