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(10-2x)2=50
We move all terms to the left:
(10-2x)2-(50)=0
We add all the numbers together, and all the variables
(-2x+10)2-50=0
We multiply parentheses
-4x+20-50=0
We add all the numbers together, and all the variables
-4x-30=0
We move all terms containing x to the left, all other terms to the right
-4x=30
x=30/-4
x=-7+1/2
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