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5x+9=81-12x/3
We move all terms to the left:
5x+9-(81-12x/3)=0
We add all the numbers together, and all the variables
5x-(-12x/3+81)+9=0
We get rid of parentheses
5x+12x/3-81+9=0
We multiply all the terms by the denominator
5x*3+12x-81*3+9*3=0
We add all the numbers together, and all the variables
12x+5x*3-216=0
Wy multiply elements
12x+15x-216=0
We add all the numbers together, and all the variables
27x-216=0
We move all terms containing x to the left, all other terms to the right
27x=216
x=216/27
x=8
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