The 7 times table lists the multiples of 7: 7 × 1 = 7, 7 × 2 = 14, … 7 × 12 = 84. "7x" usually refers to this multiplication table.
"7x" can mean 7 times a variable, but most people searching it want the 7 times table: 7 × 1 = 7, 7 × 2 = 14, … 7 × 12 = 84.
Learn the multiples of 7 from 7 × 1 = 7 up to 7 × 12 = 84. Count up by 7 each time, or drill yourself with the table above.