7r-8-4r=25

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Solution for 7r-8-4r=25 equation:


Simplifying
7r + -8 + -4r = 25

Reorder the terms:
-8 + 7r + -4r = 25

Combine like terms: 7r + -4r = 3r
-8 + 3r = 25

Solving
-8 + 3r = 25

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + 3r = 25 + 8

Combine like terms: -8 + 8 = 0
0 + 3r = 25 + 8
3r = 25 + 8

Combine like terms: 25 + 8 = 33
3r = 33

Divide each side by '3'.
r = 11

Simplifying
r = 11

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