42+(12+r)=

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Solution for 42+(12+r)= equation: 


Simplifying
42 + (12 + r) = 0

Remove parenthesis around (12 + r)
42 + 12 + r = 0

Combine like terms: 42 + 12 = 54
54 + r = 0

Solving
54 + r = 0

Solving for variable 'r'.

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

Add '-54' to each side of the equation.
54 + -54 + r = 0 + -54

Combine like terms: 54 + -54 = 0
0 + r = 0 + -54
r = 0 + -54

Combine like terms: 0 + -54 = -54
r = -54

Simplifying
r = -54

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