Solving a linear equation
Then
1/2s = 7/2
(1/2)s = 7/2
Its important to use correctly parenthesis
In 1/2s, s is dividing
In (1/2)s , s is multiplying
Then
1/2s = 7/2
1/(7/2) = 2s
2/7 = 2 s
1/7 = s
And , using parenthesis if
(1/2)s = 7/2
s = (7/2)/(1/2) = 7