2.5r-1.5-r=0.15

Solution for 2.5r-1.5-r=0.15 equation:

Simplifying
2.5r + -1.5 + -1r = 0.15

Reorder the terms:
-1.5 + 2.5r + -1r = 0.15

Combine like terms: 2.5r + -1r = 1.5r
-1.5 + 1.5r = 0.15

Solving
-1.5 + 1.5r = 0.15

Solving for variable 'r'.

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

Add '1.5' to each side of the equation.
-1.5 + 1.5 + 1.5r = 0.15 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 1.5r = 0.15 + 1.5
1.5r = 0.15 + 1.5

Combine like terms: 0.15 + 1.5 = 1.65
1.5r = 1.65

Divide each side by '1.5'.
r = 1.1

Simplifying
r = 1.1