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40-x=9+2x
We move all terms to the left:
40-x-(9+2x)=0
We add all the numbers together, and all the variables
-x-(2x+9)+40=0
We add all the numbers together, and all the variables
-1x-(2x+9)+40=0
We get rid of parentheses
-1x-2x-9+40=0
We add all the numbers together, and all the variables
-3x+31=0
We move all terms containing x to the left, all other terms to the right
-3x=-31
x=-31/-3
x=10+1/3
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