a) 70-5(x-3)=45
=> 5(x-3)=70-45
=> 5(x-3)=25
=> x-3=5
=> x=8
=> 5*(x-3)= 70-45=30
=>x-3=30/5=6
=>x=6+3=9
a) 70 - 5 ( x - 3 ) = 45
=> 5 ( x- 3 ) = 70 - 45
=> 5 ( x -3 ) = 25
=> x -3 = 25 : 5
=> x -3 = 5
=> x = 5 + 3
=> x = 8
a) 70 - 5 ( x - 3 ) = 45
5 ( x - 3 ) = 70 - 45
5( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
70 - 5 ( x - 3 ) = 45
5 ( x - 3 ) = 70 - 45
5 ( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
Vậy x = 8