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\left(20-x\right)\times 110=2090
Tāpirihia te 10 ki te 100, ka 110.
2200-110x=2090
Whakamahia te āhuatanga tohatoha hei whakarea te 20-x ki te 110.
-110x=2090-2200
Tangohia te 2200 mai i ngā taha e rua.
-110x=-110
Tangohia te 2200 i te 2090, ka -110.
x=\frac{-110}{-110}
Whakawehea ngā taha e rua ki te -110.
x=1
Whakawehea te -110 ki te -110, kia riro ko 1.