Question

Помогите решить 814 и 816 номера

Answer 1

№814
1) 12a - 1 = -a + 25
12a + a = 25 + 1
13a = 26
a = 2
2) 2 - c= 5c + 1
-5c - c = -2 + 1
-6c = -1
c = -1 / -6
c = $\frac{1}{6}$
3) 8 + 3b = -7 + 2b
-2b + 3b = -7 - 8
b = -15
4) -3d - 10 = 3d - 6
-3d - 3d = -6 + 10
-6d = 4
d = 4 / (-6d)
d =  $-\frac{4}{6}$
5) 3y - 3 = 5 - y
3y + y = 5 + 3
4y = 8
y = 2
6) -7 - 4x =  -7x + 5
7x - 4x = 5 + 7
3x = 12
x = 4
№816
1) 9 - 7y = 2,5 - 3y
6,5 = 4y
y = 1,625
2) 3,2 - 5a = -1,8a + 4

-0,8 = 3,2a
a = -0,25
3) 0,8x - 3,5 = -1,2x + 0,5
2x = 4
x = 2
4) 8,6x - 3,7 = 7,6x - 5

x = -1,3