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x-2+x-2+x-2+x-2+x-2=40
We move all terms to the left:
x-2+x-2+x-2+x-2+x-2-(40)=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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