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2x-4(5x+1)=3x+1
We move all terms to the left:
2x-4(5x+1)-(3x+1)=0
We multiply parentheses
2x-20x-(3x+1)-4=0
We get rid of parentheses
2x-20x-3x-1-4=0
We add all the numbers together, and all the variables
-21x-5=0
We move all terms containing x to the left, all other terms to the right
-21x=5
x=5/-21
x=-5/21
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