Whakaoti mō z
z = \frac{21}{8} = 2\frac{5}{8} = 2.625
Tohaina
Kua tāruatia ki te papatopenga
4z-8-5+4=4-4z+8
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te z-2.
4z-13+4=4-4z+8
Tangohia te 5 i te -8, ka -13.
4z-9=4-4z+8
Tāpirihia te -13 ki te 4, ka -9.
4z-9=12-4z
Tāpirihia te 4 ki te 8, ka 12.
4z-9+4z=12
Me tāpiri te 4z ki ngā taha e rua.
8z-9=12
Pahekotia te 4z me 4z, ka 8z.
8z=12+9
Me tāpiri te 9 ki ngā taha e rua.
8z=21
Tāpirihia te 12 ki te 9, ka 21.
z=\frac{21}{8}
Whakawehea ngā taha e rua ki te 8.
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