4s-21=0.5s

Solution for 4s-21=0.5s equation:

Simplifying
4s + -21 = 0.5s

Reorder the terms:
-21 + 4s = 0.5s

Solving
-21 + 4s = 0.5s

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-0.5s' to each side of the equation.
-21 + 4s + -0.5s = 0.5s + -0.5s

Combine like terms: 4s + -0.5s = 3.5s
-21 + 3.5s = 0.5s + -0.5s

Combine like terms: 0.5s + -0.5s = 0.0
-21 + 3.5s = 0.0

Add '21' to each side of the equation.
-21 + 21 + 3.5s = 0.0 + 21

Combine like terms: -21 + 21 = 0
0 + 3.5s = 0.0 + 21
3.5s = 0.0 + 21

Combine like terms: 0.0 + 21 = 21
3.5s = 21

Divide each side by '3.5'.
s = 6

Simplifying
s = 6