Question

faca o calculo 10x-9=7x
15x+20=8x-15
8x+7=2x+25
6x-1=2x+raiz de 3

Answer 1

$10x - 9 = 7x \\ 10x - 7x = 9 \\ 3x = 9 \\ x = \frac{9}{3} \\ x = 3$

$15x + 20 = 8x - 15 \\ 15x - 8x = - 15 - 20 \\ 7x = - 35 \\ x = \frac{ - 35}{7} \\ x = - 5$

$8x + 7 = 2x + 25 \\ 8x - 2x = 25 - 7 \\ 6x = 18 \\ x = \frac{18}{6} \\ x = 3$

$6x - 1 = 2x + \sqrt{3} \\ 6x - 2x - 1 = \sqrt{3} \\ 4x - 1 = \sqrt{3} \\ (4x - 1 {)}^{2} = { \sqrt{3} }^{2} \\ (4x - 1)(4x - 1) = 3 \\ 16 {x}^{2} - 4x - 4x + 1 - 3 = 0 \\ 16 {x}^{2} - 8x - 2 = 0 \\ 8 {x }^{2} - 4x - 1 = 0$