-15+r=-28

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Solution for -15+r=-28 equation: 


Simplifying
-15 + r = -28

Solving
-15 + r = -28

Solving for variable 'r'.

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

Add '15' to each side of the equation.
-15 + 15 + r = -28 + 15

Combine like terms: -15 + 15 = 0
0 + r = -28 + 15
r = -28 + 15

Combine like terms: -28 + 15 = -13
r = -13

Simplifying
r = -13

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