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0.3x+0.4=0.12
We move all terms to the left:
0.3x+0.4-(0.12)=0
We add all the numbers together, and all the variables
0.3x+0.28=0
We move all terms containing x to the left, all other terms to the right
0.3x=-0.28
x=-0.28/0.3
x=-0.28/0.3
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