Question

Rezolvati in R ecuatia
5 (x-3)-2 (x-7)=7-7 (2x+6)


5 (8x-1)-7 (4x+1)=9-8 (7-4x)

Answer 1

$5(x - 3) - 2(x - 7) = 7 - 7(2x + 6)$

$5x - 15 - 2x + 14 = 7 - 14x - 42$

$5x - 2x + 14x =7 - 42 + 15 - 14$

$17x = - 34 \: | \div 17$

$x = - 2 \: \in \: \mathbb{R}$

$5(8x - 1) - 7(4x + 1) = 9 - 8(7 - 4x)$

$40x - 5 - 28x - 7 = 9 - 56 + 32x$

$40x - 28x - 32x = 9 - 56 + 5 + 7$

$- 20x = - 35 \: | \div ( - 5)$

$4x = 7$

$x = \frac{7}{4} \: \in \: \mathbb{R}$