3s+6-1s=21-1s

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Solution for 3s+6-1s=21-1s equation:


Simplifying
3s + 6 + -1s = 21 + -1s

Reorder the terms:
6 + 3s + -1s = 21 + -1s

Combine like terms: 3s + -1s = 2s
6 + 2s = 21 + -1s

Solving
6 + 2s = 21 + -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.
6 + 2s + s = 21 + -1s + s

Combine like terms: 2s + s = 3s
6 + 3s = 21 + -1s + s

Combine like terms: -1s + s = 0
6 + 3s = 21 + 0
6 + 3s = 21

Add '-6' to each side of the equation.
6 + -6 + 3s = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3s = 21 + -6
3s = 21 + -6

Combine like terms: 21 + -6 = 15
3s = 15

Divide each side by '3'.
s = 5

Simplifying
s = 5

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