Решение:
16 + 6x = 5 * 1 - 5 * 2x - 13
16 + 6x = 5 - 10x - 13
16 + 6x = -8 - 10x
6x + 10x = -8 - 16
16x = -24
x = -24 / 16
x = -3 / 2
x = -1.5
Ответ: -1.5