Datrys ar gyfer p
p=400
Rhannu
Copïo i clipfwrdd
50000+150p-250p=10000
Tynnu 250p o'r ddwy ochr.
50000-100p=10000
Cyfuno 150p a -250p i gael -100p.
-100p=10000-50000
Tynnu 50000 o'r ddwy ochr.
-100p=-40000
Tynnu 50000 o 10000 i gael -40000.
p=\frac{-40000}{-100}
Rhannu’r ddwy ochr â -100.
p=400
Rhannu -40000 â -100 i gael 400.
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