7(s-1)=21

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Solution for 7(s-1)=21 equation: 


Simplifying
7(s + -1) = 21

Reorder the terms:
7(-1 + s) = 21
(-1 * 7 + s * 7) = 21
(-7 + 7s) = 21

Solving
-7 + 7s = 21

Solving for variable 's'.

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

Add '7' to each side of the equation.
-7 + 7 + 7s = 21 + 7

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

Combine like terms: 21 + 7 = 28
7s = 28

Divide each side by '7'.
s = 4

Simplifying
s = 4

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