Question

Resolva as equações:
a) 5x + 3x = 16
b) x + x + 8 = 54
c) 7x – 2 – 5x = 18
d) 12x – 10x – 4 = 11
e) 15 – 5x + 6x = 18
f) – 2x – 4x = – 12

Answer 1

Resposta:

a) 5x+3x=16

8x=16

x=16/8

x=2

b) x+x+8=54

2x+8=54

2x=54-8

x=46/2

x=23

c) 7x-2-5x=18

7x-5x=18+2

2x=20

x=20/2

x=10

d) 12x-10x-4=11

2x=11+4

x=15/2

x=7,5

e) 15-5x+6x=18

-5x+6x=18-15

x=3

f) -2x-4x=-12

-6x=-12

x=-12/-6

x=2

Answer 2

$a)5x + 3x = 16 \\ 8x = 15 \\ x = 2$

$b)x + x + 8 = 54 \\ 2x + 8 = 54 \\ 2x = 54 - 8 \\ 2x = 46 \\ x = 23$

$c)7x - 2 - 5x = 18 \\ 2x - 2 = 18 \\ 2x = 18 + 2 \\ 2x = 20 \\ x = 10$

$d)12x - 10x - 4 = 11 \\ 2x - 4 = 11 \\ 2x = 11 + 4 \\ 2x = 15 \\ x = \frac{15}{2}$

$e)15 - 5x + 6x = 18 \\ 15 + x = 18 \\ x = 18 - 15 \\ x = 3$

$f) - 2x - 4x = - 12 \\ - 6x = - 12 \\ x = 2$