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To find out how much money Jacqueline will earn at her two jobs this week, you need to evaluate the expression 15l + 12s for l = 5 and s = 7.
Substituting l = 5 and s = 7 into the expression, we get:
15(5) + 12(7)
Evaluating the expression:
= 75 + 84
= 159
Therefore, Jacqueline will earn $159 at her two jobs this week.