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4(20-x)=16
We move all terms to the left:
4(20-x)-(16)=0
We add all the numbers together, and all the variables
4(-1x+20)-16=0
We multiply parentheses
-4x+80-16=0
We add all the numbers together, and all the variables
-4x+64=0
We move all terms containing x to the left, all other terms to the right
-4x=-64
x=-64/-4
x=+16
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