Question

preciso do cálculo

8(x-2)=-2(x-1)
a)+3
b)
$+ \frac{9}{5}$
c)-3

d)
$- \frac{9}{5}$


2x+x/3=12
a)
$\frac{12}{7}$

b)4
c)
$\frac{36}{7}$

d)12


x+x/2=30
a)-60
b)-20
c)15
d)20

Answer 1

Vamos la

a)

8*(x - 2) = -2*(x - 1)

8x - 16 = -2x + 2

8x + 2x = 16 + 2

10x = 18, x = 18/10 = 9/5 (B)

b)

2x + x/3 = 12

6x + x = 36

x = 36/7 (C)

c)

x + x/2 = 30

2x + x = 60

x = 60/3 = 20 (D)