Find the missing number so that the
equation has infinitely many solutions
x- 4 = -2(-x + 2)

x-4=-2(-x+2)

x-4=2x-2

-4+2=2x-x

-2=x

x=-2

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

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