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Tohaina

10k+5=12k
Whakamahia te āhuatanga tohatoha hei whakarea te 2.5 ki te 4k+2.
10k+5-12k=0
Tangohia te 12k mai i ngā taha e rua.
-2k+5=0
Pahekotia te 10k me -12k, ka -2k.
-2k=-5
Tangohia te 5 mai i ngā taha e rua. Ko te tau i tango i te kore ka hua ko tōna korenga.
k=\frac{-5}{-2}
Whakawehea ngā taha e rua ki te -2.
k=\frac{5}{2}
Ka taea te hautanga \frac{-5}{-2} te whakamāmā ki te \frac{5}{2} mā te tango tahi i te tohu tōraro i te taurunga me te tauraro.