12=-r+11

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Solution for 12=-r+11 equation:


Simplifying
12 = -1r + 11

Reorder the terms:
12 = 11 + -1r

Solving
12 = 11 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
12 + r = 11 + -1r + r

Combine like terms: -1r + r = 0
12 + r = 11 + 0
12 + r = 11

Add '-12' to each side of the equation.
12 + -12 + r = 11 + -12

Combine like terms: 12 + -12 = 0
0 + r = 11 + -12
r = 11 + -12

Combine like terms: 11 + -12 = -1
r = -1

Simplifying
r = -1

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