15=12+s

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Solution for 15=12+s equation:


Simplifying
15 = 12 + s

Solving
15 = 12 + 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.
15 + -1s = 12 + s + -1s

Combine like terms: s + -1s = 0
15 + -1s = 12 + 0
15 + -1s = 12

Add '-15' to each side of the equation.
15 + -15 + -1s = 12 + -15

Combine like terms: 15 + -15 = 0
0 + -1s = 12 + -15
-1s = 12 + -15

Combine like terms: 12 + -15 = -3
-1s = -3

Divide each side by '-1'.
s = 3

Simplifying
s = 3

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