3(r-13)-(-12)=18

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Solution for 3(r-13)-(-12)=18 equation:


Simplifying
3(r + -13) + -1(-12) = 18

Reorder the terms:
3(-13 + r) + -1(-12) = 18
(-13 * 3 + r * 3) + -1(-12) = 18
(-39 + 3r) + -1(-12) = 18

Multiply -1 * -12
-39 + 3r + 12 = 18

Reorder the terms:
-39 + 12 + 3r = 18

Combine like terms: -39 + 12 = -27
-27 + 3r = 18

Solving
-27 + 3r = 18

Solving for variable 'r'.

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

Add '27' to each side of the equation.
-27 + 27 + 3r = 18 + 27

Combine like terms: -27 + 27 = 0
0 + 3r = 18 + 27
3r = 18 + 27

Combine like terms: 18 + 27 = 45
3r = 45

Divide each side by '3'.
r = 15

Simplifying
r = 15

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