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19*3-4*9+2x=57
We move all terms to the left:
19*3-4*9+2x-(57)=0
determiningTheFunctionDomain 2x-57+19*3-4*9=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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