13-r=7

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Solution for 13-r=7 equation: 


Simplifying
13 + -1r = 7

Solving
13 + -1r = 7

Solving for variable 'r'.

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

Add '-13' to each side of the equation.
13 + -13 + -1r = 7 + -13

Combine like terms: 13 + -13 = 0
0 + -1r = 7 + -13
-1r = 7 + -13

Combine like terms: 7 + -13 = -6
-1r = -6

Divide each side by '-1'.
r = 6

Simplifying
r = 6

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