1) 9(x-1) = x+15
9х-9-х=15
8х=15+9
8х=24
х=3
2) (11x+14) - (5x-8) = 25
11х+14-5х+8=25
6х=25-22
6х=3
х=3:6
х=0.5
3) 12-4(x-3) = 39-9x
12-4х+12+9х=39
5х=39-24
5х=15
х=3
4) 2(3x+5) - 3(4x-1) = 11.8
6х+10-12х+3=11.8
-6х=11.8-13
-6х=-1.2
х=0.2
1) 0.8(4x+5) = -3.2
3.2х+4=-3.2
3.2х=-3.2-4
3.2х=-7.2
х=-2.25
2) -2.4(7-9y) = -48
-16.8+21.6у=-48
21.6у=-48+16.8
21.6у=-31.2
у=1.4