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0.3x+0.12=0.031
We move all terms to the left:
0.3x+0.12-(0.031)=0
We add all the numbers together, and all the variables
0.3x+0.089=0
We move all terms containing x to the left, all other terms to the right
0.3x=-0.089
x=-0.089/0.3
x=-0.089/0.3
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