Question

решите уровнение :9,15 +( х -8,5 )=21,77

Answer 1

$9.15 + (x - 8.5) = 21.7 \\ x - 8.5 = 21.7 - 9.15 \\ x - 8.5 = 12.55 \\ x = 12.55 + 8.5 \\ x = 21.05$

Answer 2

9,15 +( х -8,5 )=21,77

х-8,5=21,77-9,15

х-8,5=12,62

х=12,62-8.5

х=4.12