Whakaoti mō p
p=400
Tohaina
Kua tāruatia ki te papatopenga
50000+150p-250p=10000
Tangohia te 250p mai i ngā taha e rua.
50000-100p=10000
Pahekotia te 150p me -250p, ka -100p.
-100p=10000-50000
Tangohia te 50000 mai i ngā taha e rua.
-100p=-40000
Tangohia te 50000 i te 10000, ka -40000.
p=\frac{-40000}{-100}
Whakawehea ngā taha e rua ki te -100.
p=400
Whakawehea te -40000 ki te -100, kia riro ko 400.
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