Respuesta :

Answer:

hope that helps :))

Step-by-step explanation:

Step 1: Subtract 12c from both sides.

12c+12−12c=12c+9−12c

12=9

Step 2: Subtract 12 from both sides.

12−12=9−12

0=−3
I just worked it out on a piece of paper. You subtract 12 from both sides and your left with 12=9 which is not true so you use 12≠9
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