12=5-R

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Solution for 12=5-R equation:


Simplifying
12 = 5 + -1R

Solving
12 = 5 + -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 = 5 + -1R + R

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

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

Combine like terms: 12 + -12 = 0
0 + R = 5 + -12
R = 5 + -12

Combine like terms: 5 + -12 = -7
R = -7

Simplifying
R = -7

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