Question

Resolva as equações :

a) 3(x+2) = 15
b)4(5x-6) = 2(3x+10)
c)2(x-1) -7 = 16
d)7(x-2) =5 (x+3)
e)5(2x+5) =2 (3x-4)
f)2(x-6)= -3 (5+x)
g)10(x-2) = x + 15​

Answer 1

Explicação passo-a-passo:

a) 3(x+2) = 15

3x +6 = 15

3x = 15-6

3x = 9

$\times = \frac{9}{3}$

x = 3

b)4(5x-6) = 2(3x+10)

20x - 24 = 6x + 20

20x - 6x = 20 + 24

14x = 44

$\times = \frac{44}{14}$

c)2(x-1) -7 = 16

2x -2 -7 = 16

2x = 16 +2 +7

2x = 18 +7

2x = 25

$\times = \frac{25}{2}$

d)7(x-2) =5 (x+3)

7x -14 = 5x + 15

7x -5x = 15 +14

2x = 29

$\times = \frac{29}{2}$

e)5(2x+5) =2 (3x-4)

10x + 5 = 6x -8

10x -6x = -8 -5

4x = 13

$\times = \frac{13}{4}$

f)2(x-6)= -3 (5+x)

2x -12 = -15 + (-3x)

2x -12 = -15 -3x

2x + 3x = -15 +12

5x = -3

$\times = \frac{ - 3}{5}$

g)10(x-2) = x + 15

20x - 20 = X +15

20x -X = 15 +20

19x = 35

$\times = \frac{35}{19}$