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4(5x-3)=21x=
We move all terms to the left:
4(5x-3)-(21x)=0
We add all the numbers together, and all the variables
-21x+4(5x-3)=0
We multiply parentheses
-21x+20x-12=0
We add all the numbers together, and all the variables
-1x-12=0
We move all terms containing x to the left, all other terms to the right
-x=12
x=12/-1
x=-12
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