Solve for x
x=8.6
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27.9=19.3+x
Add 6.8 and 12.5 to get 19.3.
19.3+x=27.9
Swap sides so that all variable terms are on the left hand side.
x=27.9-19.3
Subtract 19.3 from both sides.
x=8.6
Subtract 19.3 from 27.9 to get 8.6.
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