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2(5x-1)-3(4x-3)+4(2x-3)=21
We move all terms to the left:
2(5x-1)-3(4x-3)+4(2x-3)-(21)=0
We multiply parentheses
10x-12x+8x-2+9-12-21=0
We add all the numbers together, and all the variables
6x-26=0
We move all terms containing x to the left, all other terms to the right
6x=26
x=26/6
x=4+1/3
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