8r-(5r+12)=15

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Solution for 8r-(5r+12)=15 equation:


Simplifying
8r + -1(5r + 12) = 15

Reorder the terms:
8r + -1(12 + 5r) = 15
8r + (12 * -1 + 5r * -1) = 15
8r + (-12 + -5r) = 15

Reorder the terms:
-12 + 8r + -5r = 15

Combine like terms: 8r + -5r = 3r
-12 + 3r = 15

Solving
-12 + 3r = 15

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + 3r = 15 + 12

Combine like terms: -12 + 12 = 0
0 + 3r = 15 + 12
3r = 15 + 12

Combine like terms: 15 + 12 = 27
3r = 27

Divide each side by '3'.
r = 9

Simplifying
r = 9

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