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6(2x+7)=12
We move all terms to the left:
6(2x+7)-(12)=0
We multiply parentheses
12x+42-12=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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