exam Maths Puzzle Numerical Ability

How would I solve three times a number minus negative eight is less than or equal to negative seven

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An algebra class of 21 students must send 5 students to meet with the principal. How many different groups of 5 students could be formed? to write a problem in standard form do I write the equation in slope intercept form? this is my problem (0,5) m=3/5 Please help me clear this up. The way I did it was 0x+5=m