21=-3s-7s

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Solution for 21=-3s-7s equation:


Simplifying
21 = -3s + -7s

Combine like terms: -3s + -7s = -10s
21 = -10s

Solving
21 = -10s

Solving for variable 's'.

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

Add '10s' to each side of the equation.
21 + 10s = -10s + 10s

Combine like terms: -10s + 10s = 0
21 + 10s = 0

Add '-21' to each side of the equation.
21 + -21 + 10s = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 10s = 0 + -21
10s = 0 + -21

Combine like terms: 0 + -21 = -21
10s = -21

Divide each side by '10'.
s = -2.1

Simplifying
s = -2.1

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