Решите 2 уровнения плиз 1. 86 - ( 2x + 15 ) = 39 2.( 27x - 81) : 3 = 18
1) 86 - ( 2x + 15 ) = 39 2х + 15 = 86 - 39 2х +15 = 47 2х = 47 - 15 2х = 32 х = 32/2 х =16 2) ( 27x - 81) : 3 = 18 27х- 81 = 18*3 27х = 54 + 81 27 х = 135 х = 135/27 х = 5