:б)
5(2,2х+1)-4(2,5х-3)=10
11x +5 - x +12 =10
10x +17 = 10
10x = 10 - 17
10x = 3
x=3:10
x=0,3
Г)
10,2(х+16)-63,2=100
10,2(x+16)=100+63,2
10,2(x+16)=163,2
x+16=163,2:10,2
x+16=16
x=0
Е)
2,5(3у-0,4)-7,2=29
7,5y - 1 - 7,2 = 29
7,5y - 8,2 = 29
7,5y= 29+8,2
7,5y=37,2
y=37,2:7,5
y=4,96