Question

Resolva as equações do 1° grau A) 2x+30=15-3 B) 5x-20=45-15 C) 20-8=4x+10 D) 100+30-2=50x E) 10x+30=5x-15=

Answer 1

Resposta:

a)

$2x + 30 = 15 - 3$

$2x + 30 = 12 \\ 2x = 12 - 30 \\ 2x = - 18 \\ x = - 9$

b)

$5x - 20 = 45 - 15$

$5x - 20 = 30 \\ 5x = 30 + 20 \\ 5x = 50 \\ x = 10$

c)

$20 - 8 = 4x + 10$

$12x = 4x + 10 \\ - 4x = 10 - 12 \\ - 4x = - 2 \\ x = \frac{1}{2}$

d)

e)