Answer :

where are the answers?

Answer:

see below

Step-by-step explanation:

The interior angle of the triangle on the right is   180 - ( 9x+12)

  this plus the other two sum to 180 degrees

180 - (9x+12)     +     4x-3      +       6x + 3 = 180

  x   = 12

then the angles are        6(12)  + 3 = 75      4(12) -3 = 45    and    60°      

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