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5.1(x+20)=255
We move all terms to the left:
5.1(x+20)-(255)=0
We multiply parentheses
5.1x+102-255=0
We add all the numbers together, and all the variables
5.1x-153=0
We move all terms containing x to the left, all other terms to the right
5.1x=153
x=153/5.1
x=30
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