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0.4x=9+0.5x=19
We move all terms to the left:
0.4x-(9+0.5x)=0
We add all the numbers together, and all the variables
0.4x-(0.5x+9)=0
We get rid of parentheses
0.4x-0.5x-9=0
We add all the numbers together, and all the variables
-0.1x-9=0
We move all terms containing x to the left, all other terms to the right
-0.1x=9
x=9/-0.1
x=-90
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