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-4(7-5x)=20
We move all terms to the left:
-4(7-5x)-(20)=0
We add all the numbers together, and all the variables
-4(-5x+7)-20=0
We multiply parentheses
20x-28-20=0
We add all the numbers together, and all the variables
20x-48=0
We move all terms containing x to the left, all other terms to the right
20x=48
x=48/20
x=2+2/5
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