Solve for x
x=-1.3
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0.8-x=2.1
Swap sides so that all variable terms are on the left hand side.
-x=2.1-0.8
Subtract 0.8 from both sides.
-x=1.3
Subtract 0.8 from 2.1 to get 1.3.
x=-1.3
Multiply both sides by -1.
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