Every yard has 36 inches, so 7 yards is 252 inches
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-2=-x+x square-4
firstly regroup the equation
x square-2x+x-2=0
x square-x-2=0
multiply the first term by the last term.(I.e x square multiply by -2=-2x square)
product of factor = -2x 1
sum of factor= -2x+1(x)= -1
x square -2x+x-2=0
open the bracket:
x(x-2)+1(x-2)=0
x=1 or x=-2
Therefore; x=-1 or x=2
If each person would get one napkin and one cup then you would need to buy 3 cup packages and 4 napkin packages
I'm unsure what the middle term is, but a x^2 equation always has 2 solutions. Although sometimes they are not both real numbers.