8s-21-5s=15

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Solution for 8s-21-5s=15 equation:


Simplifying
8s + -21 + -5s = 15

Reorder the terms:
-21 + 8s + -5s = 15

Combine like terms: 8s + -5s = 3s
-21 + 3s = 15

Solving
-21 + 3s = 15

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 + 3s = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3s = 15 + 21
3s = 15 + 21

Combine like terms: 15 + 21 = 36
3s = 36

Divide each side by '3'.
s = 12

Simplifying
s = 12

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