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90=84+(x+3)
We move all terms to the left:
90-(84+(x+3))=0
We calculate terms in parentheses: -(84+(x+3)), so:We get rid of parentheses
84+(x+3)
determiningTheFunctionDomain (x+3)+84
We get rid of parentheses
x+3+84
We add all the numbers together, and all the variables
x+87
Back to the equation:
-(x+87)
-x-87+90=0
We add all the numbers together, and all the variables
-1x+3=0
We move all terms containing x to the left, all other terms to the right
-x=-3
x=-3/-1
x=+3
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