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-105=4x+5x+3
We move all terms to the left:
-105-(4x+5x+3)=0
We add all the numbers together, and all the variables
-(9x+3)-105=0
We get rid of parentheses
-9x-3-105=0
We add all the numbers together, and all the variables
-9x-108=0
We move all terms containing x to the left, all other terms to the right
-9x=108
x=108/-9
x=-12
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