Whakaoti mō x
x=-\frac{5}{7}\approx -0.714285714
Graph
Tohaina
Kua tāruatia ki te papatopenga
15+25x-4x=0
Tangohia te 4x mai i ngā taha e rua.
15+21x=0
Pahekotia te 25x me -4x, ka 21x.
21x=-15
Tangohia te 15 mai i ngā taha e rua. Ko te tau i tango i te kore ka hua ko tōna korenga.
x=\frac{-15}{21}
Whakawehea ngā taha e rua ki te 21.
x=-\frac{5}{7}
Whakahekea te hautanga \frac{-15}{21} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.
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