-9(9+r)-3(10r-1)=39

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Solution for -9(9+r)-3(10r-1)=39 equation:


Simplifying
-9(9 + r) + -3(10r + -1) = 39
(9 * -9 + r * -9) + -3(10r + -1) = 39
(-81 + -9r) + -3(10r + -1) = 39

Reorder the terms:
-81 + -9r + -3(-1 + 10r) = 39
-81 + -9r + (-1 * -3 + 10r * -3) = 39
-81 + -9r + (3 + -30r) = 39

Reorder the terms:
-81 + 3 + -9r + -30r = 39

Combine like terms: -81 + 3 = -78
-78 + -9r + -30r = 39

Combine like terms: -9r + -30r = -39r
-78 + -39r = 39

Solving
-78 + -39r = 39

Solving for variable 'r'.

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

Add '78' to each side of the equation.
-78 + 78 + -39r = 39 + 78

Combine like terms: -78 + 78 = 0
0 + -39r = 39 + 78
-39r = 39 + 78

Combine like terms: 39 + 78 = 117
-39r = 117

Divide each side by '-39'.
r = -3

Simplifying
r = -3

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