(7s-18)+(2s)=90

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Solution for (7s-18)+(2s)=90 equation: 


Simplifying
(7s + -18) + (2s) = 90

Reorder the terms:
(-18 + 7s) + (2s) = 90

Remove parenthesis around (-18 + 7s)
-18 + 7s + (2s) = 90

Combine like terms: 7s + (2s) = 9s
-18 + 9s = 90

Solving
-18 + 9s = 90

Solving for variable 's'.

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

Add '18' to each side of the equation.
-18 + 18 + 9s = 90 + 18

Combine like terms: -18 + 18 = 0
0 + 9s = 90 + 18
9s = 90 + 18

Combine like terms: 90 + 18 = 108
9s = 108

Divide each side by '9'.
s = 12

Simplifying
s = 12

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