реши уравнение (-х-4)-(-2х-20)=10 ; 5х+2х-7=11+5х; у-(5у+12)+9=3у

2. 5х+2х-7=11+5х5х+2х-5х=11+72х=18Х=18:2Х=9

1. (-x-4) - (-2x-20) = 10-x - 4 +2x + 20 = 10x = 10 +4 -20x = -62. 5x+2x-7=11+5x5x+2x-5x=11+72x=18|:2x=93. y-(5y+12)+9=3yy-5y-12+9=3yy-5y-3y=12-9-7y=3|:-7y=-3/7