S+18=-3

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Solution for S+18=-3 equation: 


Simplifying
S + 18 = -3

Reorder the terms:
18 + S = -3

Solving
18 + S = -3

Solving for variable 'S'.

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

Add '-18' to each side of the equation.
18 + -18 + S = -3 + -18

Combine like terms: 18 + -18 = 0
0 + S = -3 + -18
S = -3 + -18

Combine like terms: -3 + -18 = -21
S = -21

Simplifying
S = -21

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