45 + 5 . ( x- 3 ) = 70
5 . ( x- 3 ) = 70 - 45
5 . ( x- 3 ) = 15
x- 3 = 15 : 5
x- 3 = 3
x = 3 + 3
x = 6
ớ chết cái vừa nãy tính sai nhá
45 + 5 . ( x- 3 ) = 70
5 . ( x- 3 ) = 70 - 45
5 . ( x- 3 ) = 25
x- 3 = 25 : 5
x- 3 = 5
x = 5 + 3
x = 8
45 + 5 . (x-3) = 70
5 . (x-3) = 70-45
5. (x-3) = 25
x - 3 = 25:5
x - 3 = 5
x = 5 + 3
x = 8
\(45+5\left(x-3\right)=70\)
\(\Rightarrow5\left(x-3\right)=70-45\)
\(\Rightarrow5\left(x-3\right)=25\)
\(\Rightarrow x-3=25\div5\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3\)
\(\Rightarrow x=8\)
Vậy \(x=8\)
