Question

Resuelve las siguientes expresiones

3 ( x + 4)= 5x - 36
5 ( r + 6)= -5 (r - 4)
9 (a - 6)= 4 (a + 4)
15m= 3 (m - 8)
4 (3d - 5) - 8d= 7d + 14
2 (n - 4)= 3 (n - 5)

Ayuda xfa

Answer 1

3 ( x + 4 ) = 5x - 36
3x + 12 = 5x - 36
3x - 5x = - 36 - 12
- 2x = - 48
x = - 48 ÷ - 2
x = 24

5 ( r + 6 )= - 5 ( r - 4 )
5r + 30 = - 5r - 20
5r + 5r = - 20 - 30
10r = - 50
r = - 50 ÷ 10
r = - 5

9 ( a - 6 ) = 4 ( a + 4 )
9a - 54 = 4a + 16
9a - 4a = 16 + 54
5a = 70
a = 70 ÷ 5
a = 14

15m = 3 ( m - 8 )
15m = 3m - 24
15m - 3m = - 24
12m = - 24
m = - 24 ÷ 12
m = - 2

4 ( 3d - 5 ) - 8d = 7d + 14
12d - 20 - 8d = 7d + 14
12d - 8d - 7d = 14 + 20
- 3d = 34
d = 34 / - 3
d = - 34 / 3

2 ( n - 4 ) = 3 ( n - 5 )
2n - 8 = 3n - 15
2n - 3n = - 15 - 8
- n = - 23
n = 23