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x-7=80-15(x+9)
We move all terms to the left:
x-7-(80-15(x+9))=0
We calculate terms in parentheses: -(80-15(x+9)), so:We get rid of parentheses
80-15(x+9)
determiningTheFunctionDomain -15(x+9)+80
We multiply parentheses
-15x-135+80
We add all the numbers together, and all the variables
-15x-55
Back to the equation:
-(-15x-55)
x+15x+55-7=0
We add all the numbers together, and all the variables
16x+48=0
We move all terms containing x to the left, all other terms to the right
16x=-48
x=-48/16
x=-3
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