Question

2. Rezolvă ecuația [2(5x – 7) + 19] : 3 - 14 = 21.
repedeee

Answer 1

Răspuns:

[2(5x – 7) + 19] : 3 - 14 = 21

(10x-14+19):3-14=21

(10x-14+19):3=21+14

10x-14+19=35·3

10x=105+14-19

x=100:10

x=10

Answer 2

Răspuns: $\green{\bf \: x=10 \: }$

$\bf [2 \cdot(5x - 7) + 19] : 3 - 14 = 21$

$\bf [2 \cdot(5x - 7) + 19] : 3 = 21 + 14$

$\bf [2 \cdot(5x - 7) + 19] : 3 = 35 \: \: \bigg| \cdot 3$

$\bf 2 \cdot(5x - 7) + 19= 105$

$\bf 2 \cdot(5x - 7)= 105 - 19$

$\bf 2 \cdot(5x - 7)= 86 \: \: \: \bigg| :2$

$\bf 5x - 7=43$

$\bf 5x=43 + 7$

$\bf 5x=50 \: \: \bigg| : 5$

$\red{ \boxed{\bf \: x=10 \: }}$

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