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4(5x+-4)=12
We move all terms to the left:
4(5x+-4)-(12)=0
We add all the numbers together, and all the variables
4(5x-4)-12=0
We multiply parentheses
20x-16-12=0
We add all the numbers together, and all the variables
20x-28=0
We move all terms containing x to the left, all other terms to the right
20x=28
x=28/20
x=1+2/5
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