-21=-7s-49

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Solution for -21=-7s-49 equation:


Simplifying
-21 = -7s + -49

Reorder the terms:
-21 = -49 + -7s

Solving
-21 = -49 + -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 = -49 + -7s + 7s

Combine like terms: -7s + 7s = 0
-21 + 7s = -49 + 0
-21 + 7s = -49

Add '21' to each side of the equation.
-21 + 21 + 7s = -49 + 21

Combine like terms: -21 + 21 = 0
0 + 7s = -49 + 21
7s = -49 + 21

Combine like terms: -49 + 21 = -28
7s = -28

Divide each side by '7'.
s = -4

Simplifying
s = -4

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