8r-3r-7=13

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Solution for 8r-3r-7=13 equation: 


Simplifying
8r + -3r + -7 = 13

Reorder the terms:
-7 + 8r + -3r = 13

Combine like terms: 8r + -3r = 5r
-7 + 5r = 13

Solving
-7 + 5r = 13

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 5r = 13 + 7

Combine like terms: -7 + 7 = 0
0 + 5r = 13 + 7
5r = 13 + 7

Combine like terms: 13 + 7 = 20
5r = 20

Divide each side by '5'.
r = 4

Simplifying
r = 4

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