7r-1-2r=4

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Solution for 7r-1-2r=4 equation: 


Simplifying
7r + -1 + -2r = 4

Reorder the terms:
-1 + 7r + -2r = 4

Combine like terms: 7r + -2r = 5r
-1 + 5r = 4

Solving
-1 + 5r = 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 + 5r = 4 + 1

Combine like terms: -1 + 1 = 0
0 + 5r = 4 + 1
5r = 4 + 1

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

Divide each side by '5'.
r = 1

Simplifying
r = 1

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