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2x-4(x-10)=50
We move all terms to the left:
2x-4(x-10)-(50)=0
We multiply parentheses
2x-4x+40-50=0
We add all the numbers together, and all the variables
-2x-10=0
We move all terms containing x to the left, all other terms to the right
-2x=10
x=10/-2
x=-5
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