Issolvi (7a-4b+3c-18)-(8a+7b-8c+6)+5(2a-b+2c-3)=

$$( 7 a - 4 b + 3 c - 18 ) - ( 8 a + 7 b - 8 c + 6 ) + 5 ( 2 a - b + 2 c - 3 ) =$$

Evalwa

$$9a-16b+21c-39$$

Passi tas-Soluzzjonijiet

Biex issib l-oppost ta' 8a+7b-8c+6, sib l-oppost ta' kull terminu.

$$7a-4b+3c-18-8a-7b-\left(-8c\right)-6+5\left(2a-b+2c-3\right)$$

L-oppost ta' -8c huwa 8c.

$$7a-4b+3c-18-8a-7b+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina 7a u -8a biex tikseb -a.

$$-a-4b+3c-18-7b+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina -4b u -7b biex tikseb -11b.

$$-a-11b+3c-18+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina 3c u 8c biex tikseb 11c.

$$-a-11b+11c-18-6+5\left(2a-b+2c-3\right)$$

Naqqas 6 minn -18 biex tikseb -24.

$$-a-11b+11c-24+5\left(2a-b+2c-3\right)$$

Uża l-propjetà distributtiva biex timmultiplika 5 b'2a-b+2c-3.

$$-a-11b+11c-24+10a-5b+10c-15$$

Ikkombina -a u 10a biex tikseb 9a.

$$9a-11b+11c-24-5b+10c-15$$

Ikkombina -11b u -5b biex tikseb -16b.

$$9a-16b+11c-24+10c-15$$

Ikkombina 11c u 10c biex tikseb 21c.

$$9a-16b+21c-24-15$$

Naqqas 15 minn -24 biex tikseb -39.

$$9a-16b+21c-39$$

Espandi

$$9a-16b+21c-39$$

Passi tas-Soluzzjonijiet

Biex issib l-oppost ta' 8a+7b-8c+6, sib l-oppost ta' kull terminu.

$$7a-4b+3c-18-8a-7b-\left(-8c\right)-6+5\left(2a-b+2c-3\right)$$

L-oppost ta' -8c huwa 8c.

$$7a-4b+3c-18-8a-7b+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina 7a u -8a biex tikseb -a.

$$-a-4b+3c-18-7b+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina -4b u -7b biex tikseb -11b.

$$-a-11b+3c-18+8c-6+5\left(2a-b+2c-3\right)$$

Ikkombina 3c u 8c biex tikseb 11c.

$$-a-11b+11c-18-6+5\left(2a-b+2c-3\right)$$

Naqqas 6 minn -18 biex tikseb -24.

$$-a-11b+11c-24+5\left(2a-b+2c-3\right)$$

Uża l-propjetà distributtiva biex timmultiplika 5 b'2a-b+2c-3.

$$-a-11b+11c-24+10a-5b+10c-15$$

Ikkombina -a u 10a biex tikseb 9a.

$$9a-11b+11c-24-5b+10c-15$$

Ikkombina -11b u -5b biex tikseb -16b.

$$9a-16b+11c-24+10c-15$$

Ikkombina 11c u 10c biex tikseb 21c.

$$9a-16b+21c-24-15$$

Naqqas 15 minn -24 biex tikseb -39.

$$9a-16b+21c-39$$