What is the final step in solving the inequality -2(5- 4x) < 6x - 42

Step 1: -10 + 8x < 6x-4
Step 2: -10 <-2x - 4
Step 3: -6 < -2x
Step 4:
<<-3
CX-3
x <3
O x > 3

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)