Question

respondem por favor é urgente!!​

Answer 1

Resposta:

a)

$\frac{10x + 20 = 4x + 5}{20} \\ 10x + 20 = 4x + 5 \\ 10x - 4x = 5 - 20 \\ 6x = - 15 \\ x = \frac{ - 15}{6} ( \div 3) = \frac{ - 5}{2}$

b)

$\frac{3x + 4 x = 12x - 1200}{12} \\ 8x - 12x = - 1200 \\ - 6x = - 1200 \\ x = \frac{ - 1200}{ - 6} \\ x = 200$

c)

$\frac{4x + 5x = 3}{6} \\ 9x = 3 \\ x = \frac{3}{9} ( \div 3) = \frac{1}{3}$

d)

$\frac{2x = 210 - 5x}{10} \\ 2x + 5x = 210 \\ 7x = 210 \\ x = \frac{210}{7} \\ x = 30$

e)