Question

Rezolvati Ecuatiile: a) 5 ∙ (4x + 3) + 7 = 3 ∙ (x + 2) – 1 b) {1–[4–(x–2):( –3)]:(-5)}:( –2) = –1 c) 9–{8–[5–(3x–4)–18]–20} = 0

Answer 1

a)5(4x+3)+7=3(x+2)-1

20x+15+7=3x+6-1

20x-3x=6-1-15-7

17x=17

x=1

b)9-{8-[5-(3x-4)-18]-20}=0

9-{8-[5-3x+4-18]-20}=0

9-{8-[-9-3x]-20}=0

9-{8+9+3x-20}=0

9-{-3+3x}=0

9+3-3x=0

-3x=-12

x=-12:(-3)

x=4