Question

Equação de 1° grau,exercícios=
A- 3x=18
B- X+9=12
C- 3X+6=12
D- 4X-12=48
E- X=39

F- 2×(4+X)=28
G- X+4=X
3
H- 5X+5=
2

Answer 1

a)$3x=18\\x=\frac{18}{3}$

$\boxed{\boxed{x=6}}$

b)

$x+9=12\\x=12-9$

$\boxed{\boxed{x=3}}$

c)

$3x+6=12\\3x=12-6\\3x=6\\x=\frac{6}{3}$

$\boxed{\boxed{x=2}}$

d)

$4x-12=48\\4x=48+12\\4x=60\\x=\frac{60}{4}$

$\boxed{\boxed{x=15}}$

e)

$\boxed{\boxed{x=39}}$

f)

$2(4+x) =28\\4+x=\frac{28}{2}\\4+x=14\\x=14-4$

$\boxed{\boxed{x=10}}$

G)

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

$\boxed{\boxed{x=2}}$

h)

$5x+5=2\\5x=2-5\\5x=-3$

$\boxed{\boxed{x=-\frac{3}{5}}}$

Answer 2

Explicação passo-a-passo:

A 3x=18 18÷3x=6

B X+9=12 X=12-9=3

C 3X+6=12 3X=12-6 X=6÷3=2

D 4X-12=48 4X=48-12 X=36÷4=9

E X=39

F 2×(4+x)=28 8+2x=28 2x=28-8=20÷2x=10

G X+4=X+3 X-X=3 -4 0X= -1

H 5X+5=2 5x=2 -5 5x= -3/5