Question

k) 5x + 9 = 8(6 - x)
1) 4(x + 10) -2(x - 5) = 0
m) 3(2x + 3) - 4(x - 1) = 3
n) 7(x - 1) - 2(x - 5) = x - 5​

Answer 1

Resposta:

k)

$5x + 9 = 8( 6 - x) \\ 5x + 9 = 48 - 8x \\ 5x + 8x = 48 - 9 \\ 13x = 41 \\ x = \frac{41}{13}$

l)

$4(x + 10) - 2(x - 5) = 0 \\ 4x + 40 - 2x + 10 = 0 \\ 2x + 50 = 0 \\ 2x = - 50 \\ x = - 50 \div 2 \\ x = - 25$

m)

$3(2x + 3) - 4(x - 1) = 3 \\ 6x + 9 - 4x + 4 = 3 \\2x + 13 = 3 \\ 2x = 3 - 13 \\ 2x = - 10 \\ x = - 10 \div 2 \\ x = - 5$

n)

$7(x - 1) - 2(x - 5) = x - 5 \\ 7x - 7 - 2x + 10 = x - 5 \\ 5x + 3 = x - 5 \\ 5x - x = - 5 - 3 \\ 4x = - 8 \\ x = - 8 \div 4 \\ x = - 2$