121=90+s

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Solution for 121=90+s equation: 


Simplifying
121 = 90 + s

Solving
121 = 90 + s

Solving for variable 's'.

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

Add '-1s' to each side of the equation.
121 + -1s = 90 + s + -1s

Combine like terms: s + -1s = 0
121 + -1s = 90 + 0
121 + -1s = 90

Add '-121' to each side of the equation.
121 + -121 + -1s = 90 + -121

Combine like terms: 121 + -121 = 0
0 + -1s = 90 + -121
-1s = 90 + -121

Combine like terms: 90 + -121 = -31
-1s = -31

Divide each side by '-1'.
s = 31

Simplifying
s = 31

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