-15=r-20

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Solution for -15=r-20 equation:


Simplifying
-15 = r + -20

Reorder the terms:
-15 = -20 + r

Solving
-15 = -20 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-15 + -1r = -20 + r + -1r

Combine like terms: r + -1r = 0
-15 + -1r = -20 + 0
-15 + -1r = -20

Add '15' to each side of the equation.
-15 + 15 + -1r = -20 + 15

Combine like terms: -15 + 15 = 0
0 + -1r = -20 + 15
-1r = -20 + 15

Combine like terms: -20 + 15 = -5
-1r = -5

Divide each side by '-1'.
r = 5

Simplifying
r = 5

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