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3(12+x)=5
We move all terms to the left:
3(12+x)-(5)=0
We add all the numbers together, and all the variables
3(x+12)-5=0
We multiply parentheses
3x+36-5=0
We add all the numbers together, and all the variables
3x+31=0
We move all terms containing x to the left, all other terms to the right
3x=-31
x=-31/3
x=-10+1/3
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