Find x

5x-7+8x-55

13 points

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Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

The square root of 9x plus 7 plus the square rot of 2x equall to 7

See attachment below and find the equivalent of tan(∠qsr)