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360=200+a+(2a-50)
We move all terms to the left:
360-(200+a+(2a-50))=0
We calculate terms in parentheses: -(200+a+(2a-50)), so:We get rid of parentheses
200+a+(2a-50)
determiningTheFunctionDomain a+(2a-50)+200
We get rid of parentheses
a+2a-50+200
We add all the numbers together, and all the variables
3a+150
Back to the equation:
-(3a+150)
-3a-150+360=0
We add all the numbers together, and all the variables
-3a+210=0
We move all terms containing a to the left, all other terms to the right
-3a=-210
a=-210/-3
a=+70
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