8-r=4

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Solution for 8-r=4 equation: 


Simplifying
8 + -1r = 4

Solving
8 + -1r = 4

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + -1r = 4 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 4 + -8
-1r = 4 + -8

Combine like terms: 4 + -8 = -4
-1r = -4

Divide each side by '-1'.
r = 4

Simplifying
r = 4

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