3(7+s)=90

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Solution for 3(7+s)=90 equation: 


Simplifying
3(7 + s) = 90
(7 * 3 + s * 3) = 90
(21 + 3s) = 90

Solving
21 + 3s = 90

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 = 90 + -21

Combine like terms: 21 + -21 = 0
0 + 3s = 90 + -21
3s = 90 + -21

Combine like terms: 90 + -21 = 69
3s = 69

Divide each side by '3'.
s = 23

Simplifying
s = 23

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