Question

vreau sa ma verific , ma ajuta cineva cu ex 1?

Answer 1

$a)3x - 8 = 16$

$3x = 16 + 8$

$3x = 24 \: | \div 3$

$x = 8 \: \in \: \mathbb{Q}$

$b)2(x - 1) + 5 = 30 - x$

$2x - 2 + 5 = 30 - x$

$2x + x = 30 + 2 - 5$

$3x = 27 \: | \div 3$

$x = 9 \: \in \: \mathbb{Q}$

$c) \frac{x + 2}{3} - \frac{1 - x}{4} = \frac{2x + 3}{6} \: | \times 12$

$4(x + 2) - 3(1 - x) = 2(2x + 3)$

$4x + 8 - 3 + 3x = 4x + 6$

$4x + 3x - 4x = 6 - 8 + 3$

$3x = - 2 + 3$

$3x = 1$

$x = \frac{1}{3} \: \in \: \mathbb{Q}$