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4x-1=14x-21
We move all terms to the left:
4x-1-(14x-21)=0
We get rid of parentheses
4x-14x+21-1=0
We add all the numbers together, and all the variables
-10x+20=0
We move all terms containing x to the left, all other terms to the right
-10x=-20
x=-20/-10
x=+2
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