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12x+6(2x-1)+7=49
We move all terms to the left:
12x+6(2x-1)+7-(49)=0
We add all the numbers together, and all the variables
12x+6(2x-1)-42=0
We multiply parentheses
12x+12x-6-42=0
We add all the numbers together, and all the variables
24x-48=0
We move all terms containing x to the left, all other terms to the right
24x=48
x=48/24
x=2
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