-21=7s

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Solution for -21=7s equation:


Simplifying
-21 = 7s

Solving
-21 = 7s

Solving for variable 's'.

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

Add '-7s' to each side of the equation.
-21 + -7s = 7s + -7s

Combine like terms: 7s + -7s = 0
-21 + -7s = 0

Add '21' to each side of the equation.
-21 + 21 + -7s = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -7s = 0 + 21
-7s = 0 + 21

Combine like terms: 0 + 21 = 21
-7s = 21

Divide each side by '-7'.
s = -3

Simplifying
s = -3

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