-1-2r=7

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Solution for -1-2r=7 equation: 


Simplifying
-1 + -2r = 7

Solving
-1 + -2r = 7

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 + -2r = 7 + 1

Combine like terms: -1 + 1 = 0
0 + -2r = 7 + 1
-2r = 7 + 1

Combine like terms: 7 + 1 = 8
-2r = 8

Divide each side by '-2'.
r = -4

Simplifying
r = -4

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