x+2x+x=5-12

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Solution for x+2x+x=5-12 equation: 



x+2x+x=5-12

We move all terms to the left:

x+2x+x-(5-12)=0

We add all the numbers together, and all the variables

x+2x+x-(-7)=0

We add all the numbers together, and all the variables

4x+7=0

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

4x=-7

x=-7/4

x=-1+3/4

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