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2x+12-5x=0.8
We move all terms to the left:
2x+12-5x-(0.8)=0
We add all the numbers together, and all the variables
-3x+11.2=0
We move all terms containing x to the left, all other terms to the right
-3x=-11.2
x=-11.2/-3
x=3+2.2/3
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