I don't understand this one. the sum of four times a number plus three times another number. I don't know what the sum means.
4x + 3x
sum means addition. so 4 times one number + 3 times another number =4x+3y (you cannot pick x to label both numbers since you dont know that the two numbers are the same)
I didn't see the = sign on the list of symbols, ty
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