Réitigh 4200*2(100-x)=4200*1(x-20

$$4200 \times 2(100-x)=4200 \times 1(x-20$$

Réitigh do x.

$$x = \frac{220}{3} = 73\frac{1}{3} \approx 73.333333333$$

Céimeanna chun Cothromóidí Líneacha a Réiteach

Úsáid an t-airí dáileach chun 4200\times 2 a mhéadú faoi 100-x.

$$100\left(4200\times 2\right)-4200\times 2x=4200\times 1\left(x-20\right)$$

Úsáid an t-airí dáileach chun 4200\times 1 a mhéadú faoi x-20.

$$100\left(4200\times 2\right)-4200\times 2x=4200\times 1x-20\left(4200\times 1\right)$$

Bain 4200\times 1x ón dá thaobh.

$$100\left(4200\times 2\right)-4200\times 2x-4200\times 1x=-20\left(4200\times 1\right)$$

Bain 100\left(4200\times 2\right) ón dá thaobh.

$$-4200\times 2x-4200\times 1x=-20\left(4200\times 1\right)-100\left(4200\times 2\right)$$

Comhcheangail na téarmaí ar fad ina bhfuil x.

$$\left(-4200\times 2-4200\times 1\right)x=-20\left(4200\times 1\right)-100\left(4200\times 2\right)$$

Tá an chothromóid i bhfoirm chaighdeánach.

$$-12600x=-924000$$

Roinn an dá thaobh faoi -12600.

$$\frac{-12600x}{-12600}=-\frac{924000}{-12600}$$

Má roinntear é faoi -12600 cuirtear an iolrúchán faoi -12600 ar ceal.

$$x=-\frac{924000}{-12600}$$

Laghdaigh an codán \frac{-924000}{-12600} chuig na téarmaí is ísle trí 4200 a bhaint agus a chealú.

$$x=\frac{220}{3}$$