Пошаговое объяснение:
-3x - 16 = 8x + 72
-3х - 8х = 72 + 16
-11х = 88
х = 88 : (-11)
х = -8
-18 - 13x = 198 + 5x
-13х - 5х = 198 + 18
-18х = 216
х = 216 : (-18)
х = -12
1/20x + 4 = 22 + 1/5x
1/20х - 1/5х = 22 - 4
1/20х - 4/20х = 18
-3/20 х = 18
х = 18 : (-3/20)
х = 18 * (-20/3)
х = -120
