7r-12=9+4r

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Solution for 7r-12=9+4r equation:


Simplifying
7r + -12 = 9 + 4r

Reorder the terms:
-12 + 7r = 9 + 4r

Solving
-12 + 7r = 9 + 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.
-12 + 7r + -4r = 9 + 4r + -4r

Combine like terms: 7r + -4r = 3r
-12 + 3r = 9 + 4r + -4r

Combine like terms: 4r + -4r = 0
-12 + 3r = 9 + 0
-12 + 3r = 9

Add '12' to each side of the equation.
-12 + 12 + 3r = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 3r = 9 + 12
3r = 9 + 12

Combine like terms: 9 + 12 = 21
3r = 21

Divide each side by '3'.
r = 7

Simplifying
r = 7

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