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40-5x=12-9
We move all terms to the left:
40-5x-(12-9)=0
We add all the numbers together, and all the variables
-5x+40-3=0
We add all the numbers together, and all the variables
-5x+37=0
We move all terms containing x to the left, all other terms to the right
-5x=-37
x=-37/-5
x=7+2/5
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