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x-20=55-2(x-15)
We move all terms to the left:
x-20-(55-2(x-15))=0
We calculate terms in parentheses: -(55-2(x-15)), so:We get rid of parentheses
55-2(x-15)
determiningTheFunctionDomain -2(x-15)+55
We multiply parentheses
-2x+30+55
We add all the numbers together, and all the variables
-2x+85
Back to the equation:
-(-2x+85)
x+2x-85-20=0
We add all the numbers together, and all the variables
3x-105=0
We move all terms containing x to the left, all other terms to the right
3x=105
x=105/3
x=35
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