решить уравнения: 35) 1) 10x + 7 = 8x - 9;
2) 20 - 3x = 2x - 45;
3) 2,7+1,9x = 2x - 1,5;
37) 1) -3(x-4)=5x-12;
2) (16x-5)-(3-5x) = 6;
3) 26-4x=3x-7(x-3);
4) -2 (3-4x) + 5 (2-1,6x)=4;
38) 1) 4 (13-3x) - 17= -5x;
2) (18-3x) - (4 + 2x) =10;
3) 14-x=0,5(4-2x) + 12;
4) 4x - 3 (20-x)=10x - 3 (11+x).
10х+7=8х-9
10х-8х=-9-7
2х=-16
х=-16÷2
х=-8
20-3х=2х-45
-3х-2х=-45-20
-5х=-65
х=-65÷(-5)
х=13
2,7+1,9х=2х-1,5
1,9х-2х=-1,5-2,7
-0,1х=-4,2
х=-4,2÷(-0,1)
х=42
-3(х-4)=5х-12
-3х+12=5х-12
-3х-5х=-12-12
-8х=-24
х=-24÷(-8)
х=3
(16х-5)-(3-5х)=6
16х-5-3+5х=6
16х+5х=6+5+3
21х=14
х=14÷21
х=2/3