21=3(0.75c-8)

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Solution for 21=3(0.75c-8) equation:


Simplifying
21 = 3(0.75c + -8)

Reorder the terms:
21 = 3(-8 + 0.75c)
21 = (-8 * 3 + 0.75c * 3)
21 = (-24 + 2.25c)

Solving
21 = -24 + 2.25c

Solving for variable 'c'.

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

Add '-2.25c' to each side of the equation.
21 + -2.25c = -24 + 2.25c + -2.25c

Combine like terms: 2.25c + -2.25c = 0.00
21 + -2.25c = -24 + 0.00
21 + -2.25c = -24

Add '-21' to each side of the equation.
21 + -21 + -2.25c = -24 + -21

Combine like terms: 21 + -21 = 0
0 + -2.25c = -24 + -21
-2.25c = -24 + -21

Combine like terms: -24 + -21 = -45
-2.25c = -45

Divide each side by '-2.25'.
c = 20

Simplifying
c = 20

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