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X+7+X+X+X+X+7=50
We move all terms to the left:
X+7+X+X+X+X+7-(50)=0
We add all the numbers together, and all the variables
5X-36=0
We move all terms containing X to the left, all other terms to the right
5X=36
X=36/5
X=7+1/5
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