Question

Resuelve las siguientes ecuaciones:
a) 3(x-1) = x+11
b) 3x+7=2(8+x)
c) 5(4+x) = 7x-2
d) 5(3x+2) =8(9 - 2x)​

Answer 1

A)

3 (x - 1) = x + 11

3x - 3 = x + 11

3x - x = 11 + 3

2x = 14

X = 7

B)

3x + 7 = 2 (8 + x)

3x + 7 = 16 + 2x

3x - 2x = 16 - 7

X = 11

C)

5 (4 + x) = 7x - 2

20 + 5x = 7x - 2

20 + 2 = 7x - 5x

22 = 2x

22/2 = X

11 = X

D)

5 (3x + 2) = 8 (9 - 2x)

15x + 10 = 72 - 16x

15x + 16x = 72 - 10

31x = 62

X = 62/31

X = 2