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-16-x=20-3x
We move all terms to the left:
-16-x-(20-3x)=0
We add all the numbers together, and all the variables
-x-(-3x+20)-16=0
We add all the numbers together, and all the variables
-1x-(-3x+20)-16=0
We get rid of parentheses
-1x+3x-20-16=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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