Respuesta :

tonb

Answer:

12

Step-by-step explanation:

Then the -12 and +12 will cancel out, so you're left with a clean isolated r on the left:

r -12 +12 = 19 + 12

r = 31
12

So,
r+ -12+ 12 = 19+ 12
r+ 0 = 31
R=31

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