8=20+-1S

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Solution for 8=20+-1S equation: 


Simplifying
8 = 20 + -1S

Solving
8 = 20 + -1S

Solving for variable 'S'.

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

Add 'S' to each side of the equation.
8 + S = 20 + -1S + S

Combine like terms: -1S + S = 0
8 + S = 20 + 0
8 + S = 20

Add '-8' to each side of the equation.
8 + -8 + S = 20 + -8

Combine like terms: 8 + -8 = 0
0 + S = 20 + -8
S = 20 + -8

Combine like terms: 20 + -8 = 12
S = 12

Simplifying
S = 12

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