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(6x-4x)-(21x-20x)=(30/5)-(5-4)
We move all terms to the left:
(6x-4x)-(21x-20x)-((30/5)-(5-4))=0
We add all the numbers together, and all the variables
(+2x)-(+x)-(6-1)=0
We add all the numbers together, and all the variables
(+2x)-(+x)-5=0
We get rid of parentheses
2x-x-5=0
We add all the numbers together, and all the variables
x-5=0
We move all terms containing x to the left, all other terms to the right
x=5
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