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In problem 12, the first one x=7 please explain how to find that answer

In problem 12, the first one x=7 please explain how to find that answer-example-1
User Harsath
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x = 7 because there are 94 students total. If you add the others: 17+3+5+12+15+17+10+8 it equals 87. 87+7=94, aka the total amount of students.
User Sdoxsee
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Add all of the students together and you get 87. Subtract 87 from the total number of students (94) and you get 7.
User Brigette
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