-21=0.7c

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Solution for -21=0.7c equation:


Simplifying
-21 = 0.7c

Solving
-21 = 0.7c

Solving for variable 'c'.

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

Add '-0.7c' to each side of the equation.
-21 + -0.7c = 0.7c + -0.7c

Combine like terms: 0.7c + -0.7c = 0.0
-21 + -0.7c = 0.0

Add '21' to each side of the equation.
-21 + 21 + -0.7c = 0.0 + 21

Combine like terms: -21 + 21 = 0
0 + -0.7c = 0.0 + 21
-0.7c = 0.0 + 21

Combine like terms: 0.0 + 21 = 21
-0.7c = 21

Divide each side by '-0.7'.
c = -30

Simplifying
c = -30

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