Question

Calcule o valor X

A) 2x+3=15

B)7x-1=13

C) 2x-4=3

D)4x+2= -1

E) 5x-2=7+6

F) 10x+1= -4-5

Answer 1

A) 2x + 3 = 15
    2x = 15 - 3
   2x = 12
 x = 12 / 2
x = 6

B)
7x - 1 = 13
7x = 13 + 1
7x = 14
x = 14/7
x = 2

C) 2x - 4 = 3
2x = 3 + 4
2x = 7
x= 7/2 ou 3,5

D)
4x + 2 = -1
4x = -1 - 2
4x = -3
x = -3/4

E)
5x - 2 = 7 + 6
5x = 7 + 6 + 2
5x = 15
x = 15/5
x = 3
 
F)
10x + 1 = - 4 - 5
10x = - 4 - 5 - 1
10x = -10
x = 10/-10 (simplifica por 2)
x = 5/-5
x = -1

Bons estudos.

Answer 2

Olá boa tarde!

Simples veja a resolução:

A)

$2x+3=15$

$2x=15-3$

$2x=12$

$X=\dfrac {12}{2}$

$\boxed{\boxed{X = 6}}}$

B)

$7x-1=13$

$7x=13+1$

$7x=14$

$X=\dfrac {14}{7}$

$\boxed {\boxed {X = 2}}}$

C)

$2x-4=3$

$2x=3+4$

$2x=7$

$\boxed{\boxed{X =\dfrac {7}{2}}}$

D)

$4x+2= -1$

$4x=-1-2$

$4x=-3$

$boxed {\boxed {X= - \dfrac {3}{4}}}$



E)

$5x-2=7+6$

$5x=13+2$

$5x=15$

$X=\dfrac {15}{5}$

$\boxed{\boxed {X = 3}}}$

F)

$10x+1= -4-5$

$10x=-9-1$

$10x=-10$

$X= - \dfrac {10}{10}$

$\boxed {\boxed{X = -1}}}$