10(r-10)=-220

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Solution for 10(r-10)=-220 equation: 


Simplifying
10(r + -10) = -220

Reorder the terms:
10(-10 + r) = -220
(-10 * 10 + r * 10) = -220
(-100 + 10r) = -220

Solving
-100 + 10r = -220

Solving for variable 'r'.

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

Add '100' to each side of the equation.
-100 + 100 + 10r = -220 + 100

Combine like terms: -100 + 100 = 0
0 + 10r = -220 + 100
10r = -220 + 100

Combine like terms: -220 + 100 = -120
10r = -120

Divide each side by '10'.
r = -12

Simplifying
r = -12

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