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(4x+-9)=45
We move all terms to the left:
(4x+-9)-(45)=0
We add all the numbers together, and all the variables
(4x-9)-45=0
We get rid of parentheses
4x-9-45=0
We add all the numbers together, and all the variables
4x-54=0
We move all terms containing x to the left, all other terms to the right
4x=54
x=54/4
x=13+1/2
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