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-4x+3(5x-1)=8x+21
We move all terms to the left:
-4x+3(5x-1)-(8x+21)=0
We multiply parentheses
-4x+15x-(8x+21)-3=0
We get rid of parentheses
-4x+15x-8x-21-3=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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