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2*20+(5x+40)=180
We move all terms to the left:
2*20+(5x+40)-(180)=0
determiningTheFunctionDomain (5x+40)-180+2*20=0
We add all the numbers together, and all the variables
(5x+40)-140=0
We get rid of parentheses
5x+40-140=0
We add all the numbers together, and all the variables
5x-100=0
We move all terms containing x to the left, all other terms to the right
5x=100
x=100/5
x=20
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