s+3s+5s=18

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Solution for s+3s+5s=18 equation: 


Simplifying
s + 3s + 5s = 18

Combine like terms: s + 3s = 4s
4s + 5s = 18

Combine like terms: 4s + 5s = 9s
9s = 18

Solving
9s = 18

Solving for variable 's'.

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

Divide each side by '9'.
s = 2

Simplifying
s = 2

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