Question

19) Determinati soluțiile ecuațiilor:
a 6x + 3+ 2(x-4) = 7(x+2):
c 4(3x - 5) + 3(4x - 7) = 10x - 13;
e-2x + 4 +5(-x+2) = -3(2x - 7);
b 2(2x + 1)-3(3x - 5) = 4x - 19;
d 5(2x - 1) - 3x + 6(x+2) = 15 + 9x;
f 5(2x + 1)-2(3x + 2) + 3x = 13-5x.​

Answer 1

Răspuns:

a) x=19

c) x=2

e) x= -7

b) x=4

d) x=2

f) x=1

Explicație pas cu pas:

a)

6x+3+2x-8=7x+14

8x-5=7x+14

x-5=14

x=19

c)

12x-20+12x-21=10x-13

24x-41=10x-13

14x=28

x=2

e)

-2x+4-5x+10= -6x+21

-7x+14= -6x+21

14=x+21

x= -7

b)

4x+2-9x+15=4x-19

-5x+17=4x-19

17=9x-19

36=9x

x=4

d)

10x-5-3x+6x+12=15+9x

13x+7=15+9x

4x+7=15

4x=8

x=2

f)

10x+5-6x-4+3x=13-5x

7x+1=13-5x

12x+1=13

12x=12

x=1