7+4=9r+8-r

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Solution for 7+4=9r+8-r equation:


Simplifying
7 + 4 = 9r + 8 + -1r

Combine like terms: 7 + 4 = 11
11 = 9r + 8 + -1r

Reorder the terms:
11 = 8 + 9r + -1r

Combine like terms: 9r + -1r = 8r
11 = 8 + 8r

Solving
11 = 8 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
11 + -8r = 8 + 8r + -8r

Combine like terms: 8r + -8r = 0
11 + -8r = 8 + 0
11 + -8r = 8

Add '-11' to each side of the equation.
11 + -11 + -8r = 8 + -11

Combine like terms: 11 + -11 = 0
0 + -8r = 8 + -11
-8r = 8 + -11

Combine like terms: 8 + -11 = -3
-8r = -3

Divide each side by '-8'.
r = 0.375

Simplifying
r = 0.375

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