12=x+y+r

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Solution for 12=x+y+r equation: 


Simplifying
12 = x + y + r

Reorder the terms:
12 = r + x + y

Solving
12 = r + x + y

Solving for variable 'r'.

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

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

Reorder the terms:
12 + -1r = r + -1r + x + y

Combine like terms: r + -1r = 0
12 + -1r = 0 + x + y
12 + -1r = x + y

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

Combine like terms: 12 + -12 = 0
0 + -1r = x + -12 + y
-1r = x + -12 + y

Reorder the terms:
-1r = -12 + x + y

Divide each side by '-1'.
r = 12 + -1x + -1y

Simplifying
r = 12 + -1x + -1y

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