Question

a) 21x-5-(24x-7)=0
b) 3,5x-1,2=1,5x-5,2
c) 3,5x-1,2=1,5x-5,2
d) 4(2x-3)+5=7x-12
va roggg frumosss dau funda

Answer 1

$a)21x - 5 - (24x - 7) = 0$

$21x - 5 - 24x + 7 = 0$

$21x - 24x = 0 - 5 + 7$

$- 3x = - 2 \: | \times ( - 1)$

$3x = 2$

$x = \frac{2}{3}$

$b)3.5x - 1.2 = 1.5x - 5.2$

$3.5x - 1.5x = - 5.2 + 1.2$

$2x = - 4$

$x = - \frac{4}{2}$

$x = - 2$

$d)4(2x - 3) + 5 = 7x - 12$

$8x - 12 + 5= 7x - 12$

$8x - 7x = - 12 + 12 - 5$

$x = - 5$

Answer 2

La b si la c este aceasi ecuatie. Si la d la ultimele 2 randuri este gresit. Rezolvare corecta: 8x-7x=+7-12
x=-5