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140=300-20x
We move all terms to the left:
140-(300-20x)=0
We add all the numbers together, and all the variables
-(-20x+300)+140=0
We get rid of parentheses
20x-300+140=0
We add all the numbers together, and all the variables
20x-160=0
We move all terms containing x to the left, all other terms to the right
20x=160
x=160/20
x=8
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