Solve for w
w=8.6
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7.9+w=16.5
Swap sides so that all variable terms are on the left hand side.
w=16.5-7.9
Subtract 7.9 from both sides.
w=8.6
Subtract 7.9 from 16.5 to get 8.6.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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Simultaneous equation
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