3(x+1)-5(x-1)=-21 eching

$$3 ( x + 1 ) - 5 ( x - 1 ) = - 21$$

x uchun yechish

$$x = \frac{29}{2} = 14\frac{1}{2} = 14,5$$

Chiziqli tenglamalarni yechish bo'yicha qadamlar

3 ga x+1 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$3x+3-5\left(x-1\right)=-21$$

-5 ga x-1 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$3x+3-5x+5=-21$$

-2x ni olish uchun 3x va -5x ni birlashtirish.

$$-2x+3+5=-21$$

8 olish uchun 3 va 5'ni qo'shing.

$$-2x+8=-21$$

Ikkala tarafdan 8 ni ayirish.

$$-2x=-21-8$$

-29 olish uchun -21 dan 8 ni ayirish.

$$-2x=-29$$

Ikki tarafini -2 ga bo‘ling.

$$x=\frac{-29}{-2}$$

Ikkala surat va maxrajdan manfiy belgini olib tashlash bilan \frac{-29}{-2} kasrini \frac{29}{2} ga soddalashtirish mumkin.

$$x=\frac{29}{2}$$