1/2х=5
х=5:1/2
х=10
1/2*10=5
5=5
1/5х=4
х=4:1/5
х=4*5/1
х=20
1/5*20=4
4=4
2х=0,6
х=0,6:2
х=0,3
2*0,3=0,6
0,6=0,6
9х=3
х=3/9
х=1/3
9*1/3=3
3=3
5х=1
х=1/5
5*1/5=1
1=1
- 0,6 * ( 1,6b - 5 ) - ( 2,9b - 8 ) - 4 * ( 4 - 1,5b ) = - 0,96b + 3 - 2,9b + 8 - 16 + 6b = - 3,86b + 6b + 11 - 16 = 2,14b - 5
b = - 9/13
2,14 * ( - 9/13 ) - 5 = - ( 107/50 ) * ( - 9/13 ) - 5 = + ( 963/650 ) - 5 = 1 ( 313/650 ) - 5 = - 3 ( 337/650 )