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0.8x-12=0.3x+2
We move all terms to the left:
0.8x-12-(0.3x+2)=0
We get rid of parentheses
0.8x-0.3x-2-12=0
We add all the numbers together, and all the variables
0.5x-14=0
We move all terms containing x to the left, all other terms to the right
0.5x=14
x=14/0.5
x=28
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