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20x+5=180-90-x
We move all terms to the left:
20x+5-(180-90-x)=0
We add all the numbers together, and all the variables
20x-(-1x+90)+5=0
We get rid of parentheses
20x+1x-90+5=0
We add all the numbers together, and all the variables
21x-85=0
We move all terms containing x to the left, all other terms to the right
21x=85
x=85/21
x=4+1/21
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