Firstly we start with the rule of
BODMAS
We solve the bracketss
6(2x-10)÷2=40
6(2x-10)
12x-60
then we do division
12x-60÷2=40
-60÷2
-30
we write the equation as
12x-30=40
since we are looking for the value of x
we make x the subject..
12x-30=40
12x=40+30
12x=70
x= 5 10/12