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0.3x-0.2=0.7
We move all terms to the left:
0.3x-0.2-(0.7)=0
We add all the numbers together, and all the variables
0.3x-0.9=0
We move all terms containing x to the left, all other terms to the right
0.3x=0.9
x=0.9/0.3
x=3+1.1102230246252E-16/0.3
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