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10+0.2x=9.1
We move all terms to the left:
10+0.2x-(9.1)=0
We add all the numbers together, and all the variables
0.2x+0.9=0
We move all terms containing x to the left, all other terms to the right
0.2x=-0.9
x=-0.9/0.2
x=-4+0.1/0.2
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