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9+0.2x=12+0.8x
We move all terms to the left:
9+0.2x-(12+0.8x)=0
We add all the numbers together, and all the variables
0.2x-(0.8x+12)+9=0
We get rid of parentheses
0.2x-0.8x-12+9=0
We add all the numbers together, and all the variables
-0.6x-3=0
We move all terms containing x to the left, all other terms to the right
-0.6x=3
x=3/-0.6
x=-5
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