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x+x+2+x+4+x+6=-28.
We move all terms to the left:
x+x+2+x+4+x+6-(-28.)=0
We add all the numbers together, and all the variables
x+x+x+x+2+4+6-(-28)=0
We add all the numbers together, and all the variables
4x+40=0
We move all terms containing x to the left, all other terms to the right
4x=-40
x=-40/4
x=-10
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