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3(x-1)+4(2x+1)=23
We move all terms to the left:
3(x-1)+4(2x+1)-(23)=0
We multiply parentheses
3x+8x-3+4-23=0
We add all the numbers together, and all the variables
11x-22=0
We move all terms containing x to the left, all other terms to the right
11x=22
x=22/11
x=2
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