Answer:
Equation: x + 10 = 28
He originally had $14 in his wallet.
Step-by-step explanation:
Let x be the original money he had in his wallet.
His grandmother gave him $10 and he now has $28 in his wallet implies:
x + 10 = 28
x = 28 - 14
x = 14
He originally had $14 in his wallet.