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Whakaoti mō x
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Tohaina

78+0.7x=1.1\left(6+x\right)
Whakareatia te 13 ki te 6, ka 78.
78+0.7x=6.6+1.1x
Whakamahia te āhuatanga tohatoha hei whakarea te 1.1 ki te 6+x.
78+0.7x-1.1x=6.6
Tangohia te 1.1x mai i ngā taha e rua.
78-0.4x=6.6
Pahekotia te 0.7x me -1.1x, ka -0.4x.
-0.4x=6.6-78
Tangohia te 78 mai i ngā taha e rua.
-0.4x=-71.4
Tangohia te 78 i te 6.6, ka -71.4.
x=\frac{-71.4}{-0.4}
Whakawehea ngā taha e rua ki te -0.4.
x=\frac{-714}{-4}
Whakarohaina te \frac{-71.4}{-0.4} mā te whakarea i te taurunga me te tauraro ki te 10.
x=\frac{357}{2}
Whakahekea te hautanga \frac{-714}{-4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te -2.