9(-9r-19)=-20r+12

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Solution for 9(-9r-19)=-20r+12 equation:


Simplifying
9(-9r + -19) = -20r + 12

Reorder the terms:
9(-19 + -9r) = -20r + 12
(-19 * 9 + -9r * 9) = -20r + 12
(-171 + -81r) = -20r + 12

Reorder the terms:
-171 + -81r = 12 + -20r

Solving
-171 + -81r = 12 + -20r

Solving for variable 'r'.

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

Add '20r' to each side of the equation.
-171 + -81r + 20r = 12 + -20r + 20r

Combine like terms: -81r + 20r = -61r
-171 + -61r = 12 + -20r + 20r

Combine like terms: -20r + 20r = 0
-171 + -61r = 12 + 0
-171 + -61r = 12

Add '171' to each side of the equation.
-171 + 171 + -61r = 12 + 171

Combine like terms: -171 + 171 = 0
0 + -61r = 12 + 171
-61r = 12 + 171

Combine like terms: 12 + 171 = 183
-61r = 183

Divide each side by '-61'.
r = -3

Simplifying
r = -3

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