X+x+2+x+6+x+10+3x=-(-21)-

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Solution for X+x+2+x+6+x+10+3x=-(-21)- equation: 



X+X+2+X+6+X+10+3X=-(-21)-

We move all terms to the left:

X+X+2+X+6+X+10+3X-(-(-21)-)=0

We add all the numbers together, and all the variables

7X=0

X=0/7

X=0

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