7(s-3)=21

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Solution for 7(s-3)=21 equation: 


Simplifying
7(s + -3) = 21

Reorder the terms:
7(-3 + s) = 21
(-3 * 7 + s * 7) = 21
(-21 + 7s) = 21

Solving
-21 + 7s = 21

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 + 7s = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 7s = 21 + 21
7s = 21 + 21

Combine like terms: 21 + 21 = 42
7s = 42

Divide each side by '7'.
s = 6

Simplifying
s = 6

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