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What is the relationship between all triangles that can be drawn given the same three angles

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Solve 3x-18=2y and 5x-6y=6 by elimination show work