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40=5x-8+4x
We move all terms to the left:
40-(5x-8+4x)=0
We add all the numbers together, and all the variables
-(9x-8)+40=0
We get rid of parentheses
-9x+8+40=0
We add all the numbers together, and all the variables
-9x+48=0
We move all terms containing x to the left, all other terms to the right
-9x=-48
x=-48/-9
x=5+1/3
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