Question

) Resolva as equações.

a) x+x+x+x+x = 10

b) 3x+4 = x-6

c) 7x = 21

d) 5x-3x+4-7 = 2x-3x+7-8

Answer 1

Resposta:

a) 5x = 10

x = 10/5

x = 2

b) 3x - x = - 6 - 4

2x = - 10

x = - 10/2

x = - 5

c) x = 21/7

x = 3

d) 5x - 3x - 2x + 3x = 7 - 8 - 4 + 7

2x + x = - 1 + 3

3x = 2

x = 2/3

x = 0,666...

Answer 2

Explicação:

$a) x+x+x+x+x = 10\\5x = 10\\x = \frac{10}{5} \\x = 2$

$b) 3x+4 = x-6\\3x - x = -6 - 4 \\2x = -10\\x = \frac{-10}{2} \\x = -5$

$c) 7x = 21$

$x = \frac{21}{7}$

$x = 3$

$d) 5x-3x+4-7 = 2x-3x+7-8\\5x-3x - 2x + 3x = + 7 - 8 - 4 + 7 \\3x = 2 \\x = \frac{2}{3}$