Question 1176715
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-3tanB-12 = 2tanB-7
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<pre>

-3tanB-12 = 2tanB-7  ---------------------->


7 - 12    = 2tanB + 3tanB


  -5      = 5tanB


   tanB   = -1


     B  = 135 degrees  or   B = 315 degrees.    <U>ANSWER</U>
</pre>

Solved.