12+6+15+r=37

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Solution for 12+6+15+r=37 equation: 


Simplifying
12 + 6 + 15 + r = 37

Combine like terms: 12 + 6 = 18
18 + 15 + r = 37

Combine like terms: 18 + 15 = 33
33 + r = 37

Solving
33 + r = 37

Solving for variable 'r'.

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

Add '-33' to each side of the equation.
33 + -33 + r = 37 + -33

Combine like terms: 33 + -33 = 0
0 + r = 37 + -33
r = 37 + -33

Combine like terms: 37 + -33 = 4
r = 4

Simplifying
r = 4

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