Julius Cai Deyao's answer to Blursotong's Primary 6 Maths Data Analysis Singapore question.

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Julius Cai Deyao
Julius Cai Deyao's answer
6 answers (A Helpful Person)
1st
I hope this leads you to the final answer.

When you transfer one value from one side of an equal sign to the other, you convert it's positive or negative value to the opposite.

In future, please use algebraic terms instead of what i have shown (File = x, Highlighter =a, Ruler = y, etc). this will make it easier