7 (x - 1) less than it equal to 35

7 (x-1) <35

7x-7<35 (distrubute the 7 into the parrethases by multiplying)

7 + 7 + 7 (add 7 to 35)

42 (get 42)

7 = 6 (divide it by 7 and get answer)

its mostly about inverse operations which are when you see a multiplication you divide on the other side which in this case the indicator is the less than (like an equal sign)