13x-21=3x+42
10x-63 = 0
10x = 63
x = 63/10
х=6,3
2y+7=-2y-7
4y+14 = 0
4y = -14
y = -14/4
у=-3,5
5x+10=3x+8
2x+2 = 0
2x = -2
x = -1
8-3y=12-2y
-y-4 = 0
y+4 = 0
y = -4
7x+5=2x-18
5x+23 = 0
5x = -23
x = -23/5
х=-4,6
13x-21=3x+42
10x-63 = 0
10x = 63
x = 63/10
х=6,3
2y+7=-2y-7
4y+14 = 0
4y = -14
y = -14/4
у=-3,5
5x+10=3x+8
2x+2 = 0
2x = -2
x = -1
8-3y=12-2y
-y-4 = 0
y+4 = 0
y = -4
7x+5=2x-18
5x+23 = 0
5x = -23
x = -23/5
х=-4,6