Whakaoti mō x (complex solution)
x\in \mathrm{C}
Whakaoti mō x
x\in \mathrm{R}
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Tohaina
Kua tāruatia ki te papatopenga
21x-7\left(3x+20\right)=-140
Whakareatia ngā taha e rua o te whārite ki te 7.
21x-21x-140=-140
Whakamahia te āhuatanga tohatoha hei whakarea te -7 ki te 3x+20.
-140=-140
Pahekotia te 21x me -21x, ka 0.
\text{true}
Whakatauritea te -140 me te -140.
x\in \mathrm{C}
He pono tēnei mō tētahi x ahakoa.
21x-7\left(3x+20\right)=-140
Whakareatia ngā taha e rua o te whārite ki te 7.
21x-21x-140=-140
Whakamahia te āhuatanga tohatoha hei whakarea te -7 ki te 3x+20.
-140=-140
Pahekotia te 21x me -21x, ka 0.
\text{true}
Whakatauritea te -140 me te -140.
x\in \mathrm{R}
He pono tēnei mō tētahi x ahakoa.
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