S+21=87

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Solution for S+21=87 equation: 


Simplifying
S + 21 = 87

Reorder the terms:
21 + S = 87

Solving
21 + S = 87

Solving for variable 'S'.

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

Add '-21' to each side of the equation.
21 + -21 + S = 87 + -21

Combine like terms: 21 + -21 = 0
0 + S = 87 + -21
S = 87 + -21

Combine like terms: 87 + -21 = 66
S = 66

Simplifying
S = 66

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