12-7r-13=7r+39-4r

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Solution for 12-7r-13=7r+39-4r equation:


Simplifying
12 + -7r + -13 = 7r + 39 + -4r

Reorder the terms:
12 + -13 + -7r = 7r + 39 + -4r

Combine like terms: 12 + -13 = -1
-1 + -7r = 7r + 39 + -4r

Reorder the terms:
-1 + -7r = 39 + 7r + -4r

Combine like terms: 7r + -4r = 3r
-1 + -7r = 39 + 3r

Solving
-1 + -7r = 39 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
-1 + -7r + -3r = 39 + 3r + -3r

Combine like terms: -7r + -3r = -10r
-1 + -10r = 39 + 3r + -3r

Combine like terms: 3r + -3r = 0
-1 + -10r = 39 + 0
-1 + -10r = 39

Add '1' to each side of the equation.
-1 + 1 + -10r = 39 + 1

Combine like terms: -1 + 1 = 0
0 + -10r = 39 + 1
-10r = 39 + 1

Combine like terms: 39 + 1 = 40
-10r = 40

Divide each side by '-10'.
r = -4

Simplifying
r = -4

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