sara001's answer to Janet Garista's Primary 6 Maths question.

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sara001
Sara001's answer
3 answers (A Helpful Person)
I make one variable the same first. Which is 2x. So that when 2x - 2x = 0. I can now focus on the rest of the variable. 5y - (-2y) = 7 - (-14)

And so on.