9r-7=13+4r

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Solution for 9r-7=13+4r equation:


Simplifying
9r + -7 = 13 + 4r

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

Solving
-7 + 9r = 13 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-7 + 9r + -4r = 13 + 4r + -4r

Combine like terms: 9r + -4r = 5r
-7 + 5r = 13 + 4r + -4r

Combine like terms: 4r + -4r = 0
-7 + 5r = 13 + 0
-7 + 5r = 13

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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