80=X+(X*.15)

Solution for 80=X+(X*.15) equation:

Simplifying
80 = X + (X * 0.15)

Reorder the terms for easier multiplication:
80 = X + (0.15X)

Combine like terms: X + (0.15X) = 1.15X
80 = 1.15X

Solving
80 = 1.15X

Solving for variable 'X'.

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

Add '-1.15X' to each side of the equation.
80 + -1.15X = 1.15X + -1.15X

Combine like terms: 1.15X + -1.15X = 0.00
80 + -1.15X = 0.00

Add '-80' to each side of the equation.
80 + -80 + -1.15X = 0.00 + -80

Combine like terms: 80 + -80 = 0
0 + -1.15X = 0.00 + -80
-1.15X = 0.00 + -80

Combine like terms: 0.00 + -80 = -80
-1.15X = -80

Divide each side by '-1.15'.
X = 69.56521739

Simplifying
X = 69.56521739