60x - 30x + 60 - 30 = 90
x.(60 - 30) + (60 - 30) = 90
x.30 + 30 = 90
30.(x+1) = 90
x+1 = 90 : 30
x+1 = 3
Vậy x = 3 - 1 = 2
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Giải
60x-30x+60-30=90
x.(60-30)+60-30=90
x.30+60-30=90
x.30+60=90+30
x.30+60=120
x.30=120-60
x.30=60
x=60:30
x=2
60x - 30x + 60 - 30 = 90
(60x+60)-(30x+30)=90
60(x+1)-30(x+1)=90
(x+1)(60-30)=90
(x+1)30=90
x+1=3
x=2
Mình cũng giải:
60x - 30x + 60 - 30 = 90
30x + 60 - 30 = 90
30x + 60 = 90 + 30
30x + 60 = 120
30x = 120 - 60
30x = 60
x = 60 : 30
x = 2
60x - 30x + 60 - 30 = 90
30x + 60 - 30 = 90
30x = 90 + 30 - 60
30x = 60
x = 60 : 30
x = 2
Vậy x = 2