Whakaoti mō r
r=\frac{12}{13}\approx 0.923076923
Tohaina
Kua tāruatia ki te papatopenga
8r-3+5r=9
Me tāpiri te 5r ki ngā taha e rua.
13r-3=9
Pahekotia te 8r me 5r, ka 13r.
13r=9+3
Me tāpiri te 3 ki ngā taha e rua.
13r=12
Tāpirihia te 9 ki te 3, ka 12.
r=\frac{12}{13}
Whakawehea ngā taha e rua ki te 13.
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