Question

Rezolvați următoarele ecuații: a) 5(2x-1)+3(x-1)-6(7x - 12) =15(8 - x)-84; b) 2(3x+4)-3x - 2 =6(2x - 3)+2(3-4x) +5(2x-3); c) 409x - 4)+2(2x-7)-7x=3(3x - 10)+5(x-22)-4; d) 2(5x-4)-(3x+2)+11=-3(-5x + 10)+ 3x -6(4x-3). Va rog frumos repede dau coroana si 5 stele ​

Answer 1

A) 10x - 5 + 3x - 3 - 42x + 72 = 120 - 15x

-29x + 64 = 120 - 15x

-14x + 64 = 120

-14x = 56

x = -4

B) 6x + 8 - 3x - 2 = 12x - 18 + 6 - 8x + 10x - 15

3x + 6 = 14x - 27

-11x + 6 = -27

-11x = -33

x = 3

C) 36x - 16 + 4x - 14 - 7x = 9x - 30 + 5x - 110 - 4

33x - 30 = 14x - 144

19x - 30 = -144

19x = - 114

x = -6

D) 10x - 8 - 3x - 2 + 11 = 15x - 30 + 3x - 24x + 18

7x + 1 = -6x - 12

13x + 1 = -12

13x = - 13

x = -1