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2x+-5.4=2.8
We move all terms to the left:
2x+-5.4-(2.8)=0
We add all the numbers together, and all the variables
2x-8.2=0
We move all terms containing x to the left, all other terms to the right
2x=8.2
x=8.2/2
x=4+0.2/2
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