7+13r-3=9r+81-7r

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Solution for 7+13r-3=9r+81-7r equation:


Simplifying
7 + 13r + -3 = 9r + 81 + -7r

Reorder the terms:
7 + -3 + 13r = 9r + 81 + -7r

Combine like terms: 7 + -3 = 4
4 + 13r = 9r + 81 + -7r

Reorder the terms:
4 + 13r = 81 + 9r + -7r

Combine like terms: 9r + -7r = 2r
4 + 13r = 81 + 2r

Solving
4 + 13r = 81 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
4 + 13r + -2r = 81 + 2r + -2r

Combine like terms: 13r + -2r = 11r
4 + 11r = 81 + 2r + -2r

Combine like terms: 2r + -2r = 0
4 + 11r = 81 + 0
4 + 11r = 81

Add '-4' to each side of the equation.
4 + -4 + 11r = 81 + -4

Combine like terms: 4 + -4 = 0
0 + 11r = 81 + -4
11r = 81 + -4

Combine like terms: 81 + -4 = 77
11r = 77

Divide each side by '11'.
r = 7

Simplifying
r = 7

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