12+7r=5+8r

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Solution for 12+7r=5+8r equation:


Simplifying
12 + 7r = 5 + 8r

Solving
12 + 7r = 5 + 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.
12 + 7r + -8r = 5 + 8r + -8r

Combine like terms: 7r + -8r = -1r
12 + -1r = 5 + 8r + -8r

Combine like terms: 8r + -8r = 0
12 + -1r = 5 + 0
12 + -1r = 5

Add '-12' to each side of the equation.
12 + -12 + -1r = 5 + -12

Combine like terms: 12 + -12 = 0
0 + -1r = 5 + -12
-1r = 5 + -12

Combine like terms: 5 + -12 = -7
-1r = -7

Divide each side by '-1'.
r = 7

Simplifying
r = 7

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