Question

min ajudemmmm por favor ​

Answer 1

Resposta e Explicação passo a passo:

a) x + 9 = 18

x = 18 - 9

x = 9

b) x - 1 = -8

x = -8 + 1

x = -7

c) 3x - 8 = 13

3x = 13 + 8

3x = 21

x = 21/3

x = 7

d) 12x - 10 = 5x + 11

12x - 5x = 11 + 10

7x = 21

x = 21/7

x = 3

e) 7x + 5 = 68 - 2x

7x + 2x = 68 - 5

9x = 63

x = 63/9

x = 7

Answer 2

Resposta:

a)

$x+9=18\\x=9$

b)

$x-1=-8\\x=-7$

c)

$3x-8=13\\3x=21\\x=\frac{21}{3}\\x=7$

d)

$12x-10=5x+11\\12x-5x=11+10\\7x=21\\x=\frac{21}{7} \\x=3$

e)

$7x+5=68-2x\\7x+2x=68-5\\9x=63\\x=\frac{63}{9} \\x=7$