Tīpoka ki ngā ihirangi matua
Whakaoti mō x
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

15x=100-10x
Whakamahia te āhuatanga tohatoha hei whakarea te 5 ki te 20-2x.
15x+10x=100
Me tāpiri te 10x ki ngā taha e rua.
25x=100
Pahekotia te 15x me 10x, ka 25x.
x=\frac{100}{25}
Whakawehea ngā taha e rua ki te 25.
x=4
Whakawehea te 100 ki te 25, kia riro ko 4.