30-r=7

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Solution for 30-r=7 equation: 


Simplifying
30 + -1r = 7

Solving
30 + -1r = 7

Solving for variable 'r'.

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

Add '-30' to each side of the equation.
30 + -30 + -1r = 7 + -30

Combine like terms: 30 + -30 = 0
0 + -1r = 7 + -30
-1r = 7 + -30

Combine like terms: 7 + -30 = -23
-1r = -23

Divide each side by '-1'.
r = 23

Simplifying
r = 23

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