5)16х + х - 7х + 27 = 217 6)х / 4 - 8 = 12
Упрощаем: х / 4 = 12 + 8
10х + 27 = 217 х / 4 = 20
10х = 217 - 27 х = 20 * 4
10х = 190 х = 80
х = 190 / 10
х = 19
7)48 / (х + 4) = 8 8)48 / х + 4 = 8
х + 4 = 48 / 8 48 / х = 8 - 4
х + 4 = 6 48 / х = 4
х = 6 - 4 х = 48 / 4
х = 2 х = 12