1) -2x+19=5x-16
-2x-5x=-19-16
-7x=-35
x= -35/-7
x = 5
2)8x-25=3x+20
8x-3x=25+20
5x=45
x=45/5
x=9
3)6-y=3(3-8)
-y= +6-15
-y= -9 /:-1
y=9
4)5(y+1,2)=7y+4
5y+6=7y+4
5y-7y=-6+4
-2y=-2
y=1
Дальше по анологии
5)4(x-3)-16=5(x-5)
4х-12-16=5х-25
4x-28=5x-25
4x-5x=+28-25
-x=3 | :-1
x= -3
6)3x-17=8x+18
7)11-5y= 12-6y
8)4y+(11,8-y)=3,8-5y
9)3x+16=8x-9