2(s+3(s-1))=18

Solution for 2(s+3(s-1))=18 equation:

Simplifying
2(s + 3(s + -1)) = 18

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

Reorder the terms:
2(-3 + s + 3s) = 18

Combine like terms: s + 3s = 4s
2(-3 + 4s) = 18
(-3 * 2 + 4s * 2) = 18
(-6 + 8s) = 18

Solving
-6 + 8s = 18

Solving for variable 's'.

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

Add '6' to each side of the equation.
-6 + 6 + 8s = 18 + 6

Combine like terms: -6 + 6 = 0
0 + 8s = 18 + 6
8s = 18 + 6

Combine like terms: 18 + 6 = 24
8s = 24

Divide each side by '8'.
s = 3

Simplifying
s = 3