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To find out how much Jacqueline will earn at her two jobs this week, we'll substitute l=5 and s=7 into the expression 15l + 12s.
Starting by substituting the values:
15 * l + 12 * s
15 * 5 + 12 * 7
Then we multiply:
75 + 84
Finally, we add the two amounts together:
75 + 84 = 159
Therefore, Jacqueline will earn $159 at her two jobs this week.