Решите уравнения: 1) -3у)=8-8(2-у) б)-5(2-2х)=2(х-3)+4 в)2х-4(х+7)=3(2-х) 2) а)1,26х+3,58=1,74х+6,46 б)0,8-(5,12+0,08у)=4,92у-у

1)
a) -(7 - 3y) = 8 - 8(2 - y)
-7 + 3y = 8 - 16 + 8y
8y - 3y = 16 - 8 - 7
5y = 1
y = 1/5 или 0.5

б) -5(2 - 2x) = 2(x - 3) + 4
-10 + 10x = 2x - 6 + 4
10x - 2x = 10 - 6 + 4
8x = 8
x = 1

в) 2x - 4(x + 7) = 3(2 - x)
2x - 4x - 28 = 6 - 3x
2x - 4x + 3x = 28 + 6
x = 34

2)
a)1.26x + 3.58 = 1.74x + 6.46
1.74x - 1.26x = 3.58 - 6.46
0.58x = -3.12
x = -3.12/0.58
x = -6

б)0.8 - (5.12 + 0.08y) = 4.92y - y
0.8 - 5.12 - 0.08y = 3.92y
0.8 - 5.12 = 3.92y + 0.08y
4y = -4.32
y = -4.32/4
y = -1.08