Помогите -(14-21х)=56 7(х+7)=10х 3(х+8)=-3х (45-у)+8=28 5(х-5)=-8х+1
1).
– (14 -21х) = 56
-14 + 21x = 56
21x = 56 + 14
21x = 70
x = 70 : 21
x = 3 1/31).
x = 3 1/3
2).
7(х + 7) = 10х
7x + 49 = 10x
10x - 7x = 49
3x = 49
x = 49 : 3
x = 16 1/3
3).
3(х +8) = - 3х
3x + 24 = -3x
3x + 3x = -24
6x = -24
x = -24 : 6
x = -4
4).
(45 - у) + 8 = 28
45 - y + 8 = 28
53 - y = 28
y = 53 - 28
y = 25
5).
5(х - 5) = - 8х + 1
5x - 25 = -8x + 1
5x + 8x = 1 + 25
13x = 26
x = 26 : 13
x = 2