84=21+9s

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Solution for 84=21+9s equation:


Simplifying
84 = 21 + 9s

Solving
84 = 21 + 9s

Solving for variable 's'.

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

Add '-9s' to each side of the equation.
84 + -9s = 21 + 9s + -9s

Combine like terms: 9s + -9s = 0
84 + -9s = 21 + 0
84 + -9s = 21

Add '-84' to each side of the equation.
84 + -84 + -9s = 21 + -84

Combine like terms: 84 + -84 = 0
0 + -9s = 21 + -84
-9s = 21 + -84

Combine like terms: 21 + -84 = -63
-9s = -63

Divide each side by '-9'.
s = 7

Simplifying
s = 7

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