Whakaoti mō P
P=60
Tohaina
Kua tāruatia ki te papatopenga
1400-10P-20P=-400
Tangohia te 20P mai i ngā taha e rua.
1400-30P=-400
Pahekotia te -10P me -20P, ka -30P.
-30P=-400-1400
Tangohia te 1400 mai i ngā taha e rua.
-30P=-1800
Tangohia te 1400 i te -400, ka -1800.
P=\frac{-1800}{-30}
Whakawehea ngā taha e rua ki te -30.
P=60
Whakawehea te -1800 ki te -30, kia riro ko 60.
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