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3x+x/3-12=18
We move all terms to the left:
3x+x/3-12-(18)=0
We add all the numbers together, and all the variables
3x+x/3-30=0
We multiply all the terms by the denominator
3x*3+x-30*3=0
We add all the numbers together, and all the variables
x+3x*3-90=0
Wy multiply elements
x+9x-90=0
We add all the numbers together, and all the variables
10x-90=0
We move all terms containing x to the left, all other terms to the right
10x=90
x=90/10
x=9
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