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
Răspuns: [tex]\green{\bf \: x=10 \: }[/tex]
[tex] \bf [2 \cdot(5x - 7) + 19] : 3 - 14 = 21[/tex]
[tex]\bf [2 \cdot(5x - 7) + 19] : 3 = 21 + 14[/tex]
[tex]\bf [2 \cdot(5x - 7) + 19] : 3 = 35 \: \: \bigg| \cdot 3 [/tex]
[tex]\bf 2 \cdot(5x - 7) + 19= 105[/tex]
[tex]\bf 2 \cdot(5x - 7)= 105 - 19[/tex]
[tex]\bf 2 \cdot(5x - 7)= 86 \: \: \: \bigg| :2[/tex]
[tex]\bf 5x - 7=43[/tex]
[tex]\bf 5x=43 + 7[/tex]
[tex]\bf 5x=50 \: \: \bigg| : 5[/tex]
[tex] \red{ \boxed{\bf \: x=10 \: }}[/tex]
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