Issolvi left(5+5+left(30-1right)dright)30/2=390

$$\frac{ \left( 5+5+ \left( 30-1 \right) d \right) 30 }{ 2 } =390$$

Solvi għal d

$$d=\frac{16}{29}\approx 0.551724138$$

Passi biex Issolvi l-Ekwazzjoni Lineari

Immultiplika ż-żewġ naħat b'2.

$$\left(5+5+\left(30-1\right)d\right)\times 30=390\times 2$$

Żid 5 u 5 biex tikseb 10.

$$\left(10+\left(30-1\right)d\right)\times 30=390\times 2$$

Naqqas 1 minn 30 biex tikseb 29.

$$\left(10+29d\right)\times 30=390\times 2$$

Uża l-propjetà distributtiva biex timmultiplika 10+29d b'30.

$$300+870d=390\times 2$$

Immultiplika 390 u 2 biex tikseb 780.

$$300+870d=780$$

Naqqas 300 miż-żewġ naħat.

$$870d=780-300$$

Naqqas 300 minn 780 biex tikseb 480.

$$870d=480$$

Iddividi ż-żewġ naħat b'870.

$$d=\frac{480}{870}$$

Naqqas il-frazzjoni \frac{480}{870} għat-termini l-aktar baxxi billi testratta u tikkanċella barra 30.

$$d=\frac{16}{29}$$