\(70-5\left(x-3\right)=45\)
\(5\left(x-3\right)=25\)
\(x-3=5\)
\(x=8\)
\(\left(x-10\right).6=18\)
\(x-10=3\)
\(x=13\)
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 = 8
b) (x - 10). 6 = 18
x - 10 = 18 : 6
x - 10 = 3
x = 3 + 10 = 13
c) 5x . 53 = 125
5x . 53= 53
5x = 53 : 53
5x = 1
(Sai thì thôi)