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11.21=x-3.14*x=
We move all terms to the left:
11.21-(x-3.14*x)=0
We add all the numbers together, and all the variables
-(-2.14x)+11.21=0
We get rid of parentheses
2.14x+11.21=0
We move all terms containing x to the left, all other terms to the right
2.14x=-11.21
x=-11.21/2.14
x=-5+0.51/2.14
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