7r-2+5r=80

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Solution for 7r-2+5r=80 equation:


Simplifying
7r + -2 + 5r = 80

Reorder the terms:
-2 + 7r + 5r = 80

Combine like terms: 7r + 5r = 12r
-2 + 12r = 80

Solving
-2 + 12r = 80

Solving for variable 'r'.

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

Add '2' to each side of the equation.
-2 + 2 + 12r = 80 + 2

Combine like terms: -2 + 2 = 0
0 + 12r = 80 + 2
12r = 80 + 2

Combine like terms: 80 + 2 = 82
12r = 82

Divide each side by '12'.
r = 6.833333333

Simplifying
r = 6.833333333

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