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X+1.2=0.90X+5.4
We move all terms to the left:
X+1.2-(0.90X+5.4)=0
We get rid of parentheses
X-0.90X-5.4+1.2=0
We add all the numbers together, and all the variables
0.1X-4.2=0
We move all terms containing X to the left, all other terms to the right
0.1X=4.2
X=4.2/0.1
X=42
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