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An Equal Sign means that one side is equal to the other. 15 = 7 + 8 7 + 8 = 15 
Numbers or variables  it doesn't make any difference. w + 5 = 14 14 = w + 5 


C  3 = 7 +3 = 3 C = 10 Did you notice that once the equation was set up with the variables on one side and the numbers on the other, it was much easier to solve?

