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3(x)+6(x)+3(x)=30
We move all terms to the left:
3(x)+6(x)+3(x)-(30)=0
We add all the numbers together, and all the variables
12x-30=0
We move all terms containing x to the left, all other terms to the right
12x=30
x=30/12
x=2+1/2
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