Whakaoti mō a_13
a_{13}=a_{18}-25
Whakaoti mō a_18
a_{18}=a_{13}+25
Tohaina
Kua tāruatia ki te papatopenga
-a_{13}=25-a_{18}
Tangohia te a_{18} mai i ngā taha e rua.
\frac{-a_{13}}{-1}=\frac{25-a_{18}}{-1}
Whakawehea ngā taha e rua ki te -1.
a_{13}=\frac{25-a_{18}}{-1}
Mā te whakawehe ki te -1 ka wetekia te whakareanga ki te -1.
a_{13}=a_{18}-25
Whakawehe 25-a_{18} ki te -1.
a_{18}=25+a_{13}
Me tāpiri te a_{13} ki ngā taha e rua.
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