Whakaoti mō b
b=-1800
Tohaina
Kua tāruatia ki te papatopenga
6000+b=4200
Pahekotia te -2b me 3b, ka b.
b=4200-6000
Tangohia te 6000 mai i ngā taha e rua.
b=-1800
Tangohia te 6000 i te 4200, ka -1800.
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