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9(x+3)-4x=77
We move all terms to the left:
9(x+3)-4x-(77)=0
We add all the numbers together, and all the variables
-4x+9(x+3)-77=0
We multiply parentheses
-4x+9x+27-77=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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