Question

xddd ayudaaaaaaaa aaaaaa​

Answer 1

$15)6x - (x + 4) = 2 + [2x - (2 - x)] \\ 6x - (x + 4) = 2 + (2x - 2 + x) \\ 6x - x - 4 = 2 + 2x - 2 + x \\ 5x - 4 = 3x \\ 5x - 3x = 4 \\ 2x = 4 \\ x = 2$

$16)3x - (8 - x) = 3 + [2x - (1 - x)] \\ 3x - (8 - x) = 3 + (2x - 1 + x) \\ 3x - 8 + x = 3 + 2x - 1 + x \\ 4x - 8 = 2 + 3x \\ 4x - 3x = 2 + 8 \\ x = 10$

$17) \frac{x}{2} + \frac{2x}{5} = 9 \\ 10( \frac{x}{2} + \frac{2x}{5} ) = 10 \times 9 \\ 5x + 4x = 90 \\ 9x = 90 \\ x = 10$

$18) \frac{5x}{4} - \frac{2x}{8} = 100 \\ 8( \frac{5x}{4} - \frac{2x}{8} ) = 8 \times 100 \\ 10x - 2x = 800 \\ 8x = 800 \\ x = 100$