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3(x+1)=4x+9
We move all terms to the left:
3(x+1)-(4x+9)=0
We multiply parentheses
3x-(4x+9)+3=0
We get rid of parentheses
3x-4x-9+3=0
We add all the numbers together, and all the variables
-1x-6=0
We move all terms containing x to the left, all other terms to the right
-x=6
x=6/-1
x=-6
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