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54=-9(x+5)
We move all terms to the left:
54-(-9(x+5))=0
We calculate terms in parentheses: -(-9(x+5)), so:We get rid of parentheses
-9(x+5)
We multiply parentheses
-9x-45
Back to the equation:
-(-9x-45)
9x+45+54=0
We add all the numbers together, and all the variables
9x+99=0
We move all terms containing x to the left, all other terms to the right
9x=-99
x=-99/9
x=-11
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