12=7r+r-5r

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


Simplifying
12 = 7r + r + -5r

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

Combine like terms: 8r + -5r = 3r
12 = 3r

Solving
12 = 3r

Solving for variable 'r'.

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

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

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

Add '-12' to each side of the equation.
12 + -12 + -3r = 0 + -12

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

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

Divide each side by '-3'.
r = 4

Simplifying
r = 4

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