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45=9x+4
We move all terms to the left:
45-(9x+4)=0
We get rid of parentheses
-9x-4+45=0
We add all the numbers together, and all the variables
-9x+41=0
We move all terms containing x to the left, all other terms to the right
-9x=-41
x=-41/-9
x=4+5/9
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