2(x + 7) + 3x = 12 (given)
2x + 14 + 3x = 12 (?)
5x + 14 = 12 (simplify)
5x = -2 (subtraction)
x = -
2
5
(division)
What is the missing reason?

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?