Question

Encontre a solução de cada equação:

a)7x = 49
b)2 - 3x = 12 - x
c)4x + 2x = 12 + 12
d)4/2x + 7 = 6/3 - 40/30
e)-x - 12 = -3x + 14
f)81x = 162
g)x + 14 = +14
h)2x - 10 =3x + 8
i)4x - 3 + 7 = 3x
j)2x - 4 = 18 - x
k)4x - 12 = +5x
l)18x - 18 = 12x - 12


Urgente por favor! Agradeço a quem me dar as respostas certas :-)

Answer 1

a)7x = 49

x=49/7

x=7

b)2 - 3x = 12 - x

-3x+x=12-2

-2x=10 * (-1)

2x=-10

x=-10/2

x=-5

c)4x + 2x = 12 + 12

6x=24

x=24/6

x=4

d)4/2x + 7 = 6/3 - 40/30

$\frac{2}{x}$+7=2-$\frac{4}{3}$

$\frac{2}{x}$+7=2-$\frac{1}{3}$
$\frac{2}{x}$+7=$\frac{5}{3}$
$\frac{2}{x}$=$\frac{5}{3}$-7
$\frac{2}{x}$=$\frac{16}{3}$
6=-16x
-16x=6*(-1)
16x=-6
x=$\frac{6}{16}$
x=$\frac{3}{8}$

e)-x - 12 = -3x + 14

-x+3x=14+12

2x=26

x=26/2

x=13

f)81x = 162

x=162/81

x=2

g)x + 14 = +14

x=14-14

x=0

h)2x - 10 =3x + 8

2x-3x=8+10

-x=18*(-1)

x=-18

i)4x - 3 + 7 = 3x

4x-3x=+3-7

x=-4

j)2x - 4 = 18 - x

2x+x=18+4

3x=22

x=22/3

k)4x - 12 = +5x

4x-5x=12

-x=12*(-1)

x=-12

l)18x - 18 = 12x - 12

18x-12x=-12+18

6x=6

x=6/6

x=1