Simple algebra question 1. The problem statement, all variables and given/known data In a biology class of s students, there are m microscopes available. if the instructor assigns one micrope to each student, 6 more microscopes will be needed. If the instructor had twice as many microscopes available and assigned one microscope to each student, 6 microscopes would be left over. What is the value of s? 2. Relevant equations 3. The attempt at a solution I solved for s by "guess + check". I tried expressing the word problem algebraically, but I can't seem to get it right. I get a negative instead of a positive value, so I find the absolute value and end up with the final results. Yet, I'm sure there is another way out. Here are my equations: sm=m-6 Hence, s= (-6/m) Second equation, 2ms=m+6 Then I do substitution and get -18??! Also, my equations don't really illustrate what is described above.