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3x+4(x-1)=9x+4
We move all terms to the left:
3x+4(x-1)-(9x+4)=0
We multiply parentheses
3x+4x-(9x+4)-4=0
We get rid of parentheses
3x+4x-9x-4-4=0
We add all the numbers together, and all the variables
-2x-8=0
We move all terms containing x to the left, all other terms to the right
-2x=8
x=8/-2
x=-4
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