3(s-5)=21

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Solution for 3(s-5)=21 equation: 


Simplifying
3(s + -5) = 21

Reorder the terms:
3(-5 + s) = 21
(-5 * 3 + s * 3) = 21
(-15 + 3s) = 21

Solving
-15 + 3s = 21

Solving for variable 's'.

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

Add '15' to each side of the equation.
-15 + 15 + 3s = 21 + 15

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

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

Divide each side by '3'.
s = 12

Simplifying
s = 12

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