-42+r=47

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Solution for -42+r=47 equation: 


Simplifying
-42 + r = 47

Solving
-42 + r = 47

Solving for variable 'r'.

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

Add '42' to each side of the equation.
-42 + 42 + r = 47 + 42

Combine like terms: -42 + 42 = 0
0 + r = 47 + 42
r = 47 + 42

Combine like terms: 47 + 42 = 89
r = 89

Simplifying
r = 89

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