1) 1.2x+21-3.2x+12=2
-2x+33=2
-2x=2-33
-2x= -31
x= 31/2
2) 4.5*7/15х+4.5*2/9-0.77*8/11х+0.77*3/7= -1.75
3/10*7х+5/5-7/25*2х+11/100*3= -1.75
21/10х+1-14/25х+33/100= -1.75
105х-28х/50+1+33/100= -1.75
77х/50+1+33/100= -1.75
1.54х+100+33/100= -1.75
1.54х+133/100= -1.75
1.54х+1.33= -1.75
1.54х= -1.75-1.33
1.54х= -3.08
х= -2
6у -3 + 18у - 24 = 83 +5у - 15
24у - 27 = 5у - 68
24у - 5у = -68 + 27
19у=- 41
у = -2 3/19
Х*9=6*9
Х*9=54
Х=54:9
Х=6
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6*9=6*9
Ответ:Х=6
5Х=17*5
5Х=85
Х=85:5
Х=17
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5*17=17*5
Ответ:Х=17
У-8=30-8
У-8=22
У=22+8
У=30
_______
30-8=30-8
Ответ:У=30