.15=-logx

Solution for .15=-logx equation:

Simplifying
0.15 = -1logx

Solving
0.15 = -1glox

Solving for variable 'g'.

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

Add 'glox' to each side of the equation.
0.15 + glox = -1glox + glox

Combine like terms: -1glox + glox = 0
0.15 + glox = 0

Add '-0.15' to each side of the equation.
0.15 + -0.15 + glox = 0 + -0.15

Combine like terms: 0.15 + -0.15 = 0.00
0.00 + glox = 0 + -0.15
glox = 0 + -0.15

Combine like terms: 0 + -0.15 = -0.15
glox = -0.15

Divide each side by 'lox'.
g = -0.15l-1o-1x-1

Simplifying
g = -0.15l-1o-1x-1