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2(x+x)=50
We move all terms to the left:
2(x+x)-(50)=0
We add all the numbers together, and all the variables
2(+2x)-50=0
We multiply parentheses
4x-50=0
We move all terms containing x to the left, all other terms to the right
4x=50
x=50/4
x=12+1/2
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