(13.5+x)*2=42.5

Solution for (13.5+x)*2=42.5 equation:

Simplifying
(13.5 + x) * 2 = 42.5

Reorder the terms for easier multiplication:
2(13.5 + x) = 42.5
(13.5 * 2 + x * 2) = 42.5
(27 + 2x) = 42.5

Solving
27 + 2x = 42.5

Solving for variable 'x'.

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

Add '-27' to each side of the equation.
27 + -27 + 2x = 42.5 + -27

Combine like terms: 27 + -27 = 0
0 + 2x = 42.5 + -27
2x = 42.5 + -27

Combine like terms: 42.5 + -27 = 15.5
2x = 15.5

Divide each side by '2'.
x = 7.75

Simplifying
x = 7.75