1)49,39
2)78,6
3)52,16
4)34,7
5)170,5
6)161,22
7)32,2
8)187,33
а) 15 - х = х - 17,
-х - х = -17 - 15,
-2х = -32,
х = -32 : (-2),
х = 16;
b) 18х = -9,
х = -9 : 18,
х = -0,5;
c) 8х - 9 = 6х + 12,
8х - 6х = 12 + 9,
2х = 21,
х = 21 : 2,
х = 10,5;
d) -3(х - 2) = 4(1 - х),
-3х + 6 = 4 - 4х,
-3х + 4х = 4 - 6,
х = -2;
e) 2 - 6(х - 1) = 3 - 4(2 - х),
2 - 6х + 6 = 3 - 8 + 4х,
8 - 6х = -5 + 4х,
-6х - 4х = -5 - 8,
-10х - -13,
х = -13 : (-10),
х = 1,3.
5.6х-3.8=4.8х+1.8
5.6х-4.8х=1.8+3.8
0.8х=5.8
х=5.8:0.8
х=7.25