1) 51 * (х - 6) = 0
51 ≠ 0
х - 6 = 0
х = 6
--------------------------------
2) (х - 3) * 84 = 0
84 ≠ 0
х - 3 = 0
х = 3
---------------------------
3) 174 * (х - 8) = 0
174 ≠ 0
х - 8 = 0
х = 8
------------------------------
4) 46 * (х - 2) = 0
46 ≠ 0
х - 2 = 0
х = 2