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40-9x=3x+64
We move all terms to the left:
40-9x-(3x+64)=0
We get rid of parentheses
-9x-3x-64+40=0
We add all the numbers together, and all the variables
-12x-24=0
We move all terms containing x to the left, all other terms to the right
-12x=24
x=24/-12
x=-2
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