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.2x+.15x=2.1
We move all terms to the left:
.2x+.15x-(2.1)=0
We add all the numbers together, and all the variables
0.35x-2.1=0
We move all terms containing x to the left, all other terms to the right
0.35x=2.1
x=2.1/0.35
x=6+4.4408920985E-16/0.35
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