2s+7s-18=90

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


Simplifying
2s + 7s + -18 = 90

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

Combine like terms: 2s + 7s = 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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