2r-r-1=4

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


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

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

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

Solving
-1 + 1r = 4

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 = 4 + 1

Combine like terms: -1 + 1 = 0
0 + 1r = 4 + 1
1r = 4 + 1

Combine like terms: 4 + 1 = 5
1r = 5

Divide each side by '1'.
r = 5

Simplifying
r = 5

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