book Maths Puzzle Numerical Ability

What is 12-7/6*15-8? Please help me solve this.

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book Other Question

A Regualr polygon of n sides inscribed in a circle of radius r has 3r squared. What is the value of n? Can someone please explain to me how to graph 3x + 2y=6?? Also, here is one other question. I need to write the equation of the line which has y-intercept (0, 5) and is perpendic