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0.3(0.1x-0.5)=12
We move all terms to the left:
0.3(0.1x-0.5)-(12)=0
We multiply parentheses
0x-0.15-12=0
We add all the numbers together, and all the variables
x-12.15=0
We move all terms containing x to the left, all other terms to the right
x=12.15
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