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12(x+x)=58
We move all terms to the left:
12(x+x)-(58)=0
We add all the numbers together, and all the variables
12(+2x)-58=0
We multiply parentheses
24x-58=0
We move all terms containing x to the left, all other terms to the right
24x=58
x=58/24
x=2+5/12
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