13r-77=15r-87

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Solution for 13r-77=15r-87 equation:


Simplifying
13r + -77 = 15r + -87

Reorder the terms:
-77 + 13r = 15r + -87

Reorder the terms:
-77 + 13r = -87 + 15r

Solving
-77 + 13r = -87 + 15r

Solving for variable 'r'.

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

Add '-15r' to each side of the equation.
-77 + 13r + -15r = -87 + 15r + -15r

Combine like terms: 13r + -15r = -2r
-77 + -2r = -87 + 15r + -15r

Combine like terms: 15r + -15r = 0
-77 + -2r = -87 + 0
-77 + -2r = -87

Add '77' to each side of the equation.
-77 + 77 + -2r = -87 + 77

Combine like terms: -77 + 77 = 0
0 + -2r = -87 + 77
-2r = -87 + 77

Combine like terms: -87 + 77 = -10
-2r = -10

Divide each side by '-2'.
r = 5

Simplifying
r = 5

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