s+s+(s+12)+.5(s+12)=81

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Solution for s+s+(s+12)+.5(s+12)=81 equation:


Simplifying
s + s + (s + 12) + 0.5(s + 12) = 81

Reorder the terms:
s + s + (12 + s) + 0.5(s + 12) = 81

Remove parenthesis around (12 + s)
s + s + 12 + s + 0.5(s + 12) = 81

Reorder the terms:
s + s + 12 + s + 0.5(12 + s) = 81
s + s + 12 + s + (12 * 0.5 + s * 0.5) = 81
s + s + 12 + s + (6 + 0.5s) = 81

Reorder the terms:
12 + 6 + s + s + s + 0.5s = 81

Combine like terms: 12 + 6 = 18
18 + s + s + s + 0.5s = 81

Combine like terms: s + s = 2s
18 + 2s + s + 0.5s = 81

Combine like terms: 2s + s = 3s
18 + 3s + 0.5s = 81

Combine like terms: 3s + 0.5s = 3.5s
18 + 3.5s = 81

Solving
18 + 3.5s = 81

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 + 3.5s = 81 + -18

Combine like terms: 18 + -18 = 0
0 + 3.5s = 81 + -18
3.5s = 81 + -18

Combine like terms: 81 + -18 = 63
3.5s = 63

Divide each side by '3.5'.
s = 18

Simplifying
s = 18

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