[s+3(s-1)]=18

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Solution for [s+3(s-1)]=18 equation:


Simplifying
[s + 3(s + -1)] = 18

Reorder the terms:
[s + 3(-1 + s)] = 18
[s + (-1 * 3 + s * 3)] = 18
[s + (-3 + 3s)] = 18

Reorder the terms:
[-3 + s + 3s] = 18

Combine like terms: s + 3s = 4s
[-3 + 4s] = 18

Remove brackets around [-3 + 4s]
-3 + 4s = 18

Solving
-3 + 4s = 18

Solving for variable 's'.

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

Add '3' to each side of the equation.
-3 + 3 + 4s = 18 + 3

Combine like terms: -3 + 3 = 0
0 + 4s = 18 + 3
4s = 18 + 3

Combine like terms: 18 + 3 = 21
4s = 21

Divide each side by '4'.
s = 5.25

Simplifying
s = 5.25

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