500*1*(87-90)+K(87-12)=0 eching

$$500 \times 1 \times ( 87 - 90 ) + K ( 87 - 12 ) = 0$$

K uchun yechish

$$K=20$$

Chiziqli tenglamalarni yechish bo'yicha qadamlar

500 hosil qilish uchun 500 va 1 ni ko'paytirish.

$$500\left(87-90\right)+K\left(87-12\right)=0$$

-3 olish uchun 87 dan 90 ni ayirish.

$$500\left(-3\right)+K\left(87-12\right)=0$$

-1500 hosil qilish uchun 500 va -3 ni ko'paytirish.

$$-1500+K\left(87-12\right)=0$$

75 olish uchun 87 dan 12 ni ayirish.

$$-1500+K\times 75=0$$

1500 ni ikki tarafga qo’shing. Har qanday songa nolni qo‘shsangiz, o‘zi chiqadi.

$$K\times 75=1500$$

Ikki tarafini 75 ga bo‘ling.

$$K=\frac{1500}{75}$$

20 ni olish uchun 1500 ni 75 ga bo‘ling.

$$K=20$$