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1.2x-9=1.8x+3
We move all terms to the left:
1.2x-9-(1.8x+3)=0
We get rid of parentheses
1.2x-1.8x-3-9=0
We add all the numbers together, and all the variables
-0.6x-12=0
We move all terms containing x to the left, all other terms to the right
-0.6x=12
x=12/-0.6
x=-20
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