Răspuns:
Explicație pas cu pas:
7× {3× [5× (2x + 3) – 30] + 2} – 19 = 100
7× {3× [5× (2x + 3) – 30] + 2} = 100+19
7× {3× [5× (2x + 3) – 30] + 2} = 119
3× [5× (2x + 3) – 30] + 2 = 119 : 7
3× [5× (2x + 3) – 30] + 2 = 17
3× [5× (2x + 3) – 30] = 17 - 2
3× [5× (2x + 3) – 30] = 15
5× (2x + 3) – 30 = 15 : 3
5× (2x + 3) – 30 = 5
5× (2x + 3) = 5 + 30
2x + 3 = 35 : 5
2x + 3 = 7
2x = 7 - 3
2x = 4
x = 4 : 2
x = 2 → soluția ecuației
