Answer: a=28
Step-by-step explanation:Simplifying
21 = 0.75a
Solving
21 = 0.75a
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '-0.75a' to each side of the equation.
21 + -0.75a = 0.75a + -0.75a
Combine like terms: 0.75a + -0.75a = 0.00
21 + -0.75a = 0.00
Add '-21' to each side of the equation.
21 + -21 + -0.75a = 0.00 + -21
Combine like terms: 21 + -21 = 0
0 + -0.75a = 0.00 + -21
-0.75a = 0.00 + -21
Combine like terms: 0.00 + -21 = -21
-0.75a = -21
Divide each side by '-0.75'.
a = 28
Simplifying
a = 28
