1)8х+2=3х-18
8x+2=3x-18
5x+20 = 0
5x = -20
x = -4
2)2х-(1+9)=20
раскроем скобки
2x-1-9 = 20
2x-30 = 0
2x = 30
x = 15
3) 7х-3×(2+1)=х+3
7x-6-3 = x+3
6x-12 = 0
6x = 12
x = 2
4) 4(у+2)=-2
4y+8 = -2
4y+10 = 0
4y = -10
y = -10/4
у=-2,5
1)8х+2=3х-18
8x+2=3x-18
5x+20 = 0
5x = -20
x = -4
2)2х-(1+9)=20
раскроем скобки
2x-1-9 = 20
2x-30 = 0
2x = 30
x = 15
3) 7х-3×(2+1)=х+3
раскроем скобки
7x-6-3 = x+3
6x-12 = 0
6x = 12
x = 2
4) 4(у+2)=-2
раскроем скобки
4y+8 = -2
4y+10 = 0
4y = -10
y = -10/4
у=-2,5