Whakaoti mō r
r = -\frac{45}{7} = -6\frac{3}{7} \approx -6.428571429
Tohaina
Kua tāruatia ki te papatopenga
9\left(r+5\right)=2r
Tē taea kia ōrite te tāupe r ki 0 nā te kore tautuhi i te whakawehenga mā te kore. Me whakarea ngā taha e rua o te whārite ki te 9r, arā, te tauraro pātahi he tino iti rawa te kitea o r,9.
9r+45=2r
Whakamahia te āhuatanga tohatoha hei whakarea te 9 ki te r+5.
9r+45-2r=0
Tangohia te 2r mai i ngā taha e rua.
7r+45=0
Pahekotia te 9r me -2r, ka 7r.
7r=-45
Tangohia te 45 mai i ngā taha e rua. Ko te tau i tango i te kore ka hua ko tōna korenga.
r=\frac{-45}{7}
Whakawehea ngā taha e rua ki te 7.
r=-\frac{45}{7}
Ka taea te hautanga \frac{-45}{7} te tuhi anō ko -\frac{45}{7} mā te tango i te tohu tōraro.
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