Question

POMOCYYYY POTRZEBNE NA JUŻ !
a).5x - 3 + 2x = 4x + 9=
b).2,5 = 2x + 8,5 =
c).2 (2x - 4) = 2x + 8
d).12 (3y + 1) = 5 (8y+3)
e).8 (3x - 2) - 13x = 5 (12 - 3x) = 7x
f).7 (2x - 14) - 5 (x - 18) = -4 (3 - 2x)
odwdzięczę się !!!

Answer 1

a)5x - 3 + 2x = 4x + 9

7x - 3 = 4x + 9

7x - 4x = 9 + 3

3x = 12 /:3

x = 4

b) 2,5 = 2x + 8,5

2,5 - 8,5 = 2x

- 6 = 2x /:2

-3 = x

c) 2 (2x - 4) = 2x + 8

4x - 8 = 2x + 8

2x = 16 /:2

x = 8

d) 12 (3y + 1) = 5 (8y+3)

36y + 12 = 40y + 15

-3 = 4y /:4

-3/4 = y

e) 8 (3x - 2) - 13x = 5 (12 - 3x) + 7x

24x - 16 - 13x = 60 - 15x + 7x

11x - 16 = 60 - 8x

19x = 76 /:19

x = 4

f) 7 (2x - 14) - 5 (x - 18) = -4 (3 - 2x)

14x - 98 - 5x + 90 = -12 + 8x

9x - 8 = - 12 + 8x

x = -4