4r-2r-r-1=15

Solution for 4r-2r-r-1=15 equation:

Simplifying
4r + -2r + -1r + -1 = 15

Reorder the terms:
-1 + 4r + -2r + -1r = 15

Combine like terms: 4r + -2r = 2r
-1 + 2r + -1r = 15

Combine like terms: 2r + -1r = 1r
-1 + 1r = 15

Solving
-1 + 1r = 15

Solving for variable 'r'.

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

Add '1' to each side of the equation.
-1 + 1 + 1r = 15 + 1

Combine like terms: -1 + 1 = 0
0 + 1r = 15 + 1
1r = 15 + 1

Combine like terms: 15 + 1 = 16
1r = 16

Divide each side by '1'.
r = 16

Simplifying
r = 16