Question

5(3-2у)-4(9-у)=3(у+5)
14(2х-3)-5(х+4)=2(3х+5)+5х
9(3х-7)+3(8х-11)=3(9х+8)
6(7х-11)-13(х-6)=14(2х+1)

Answer 1

1) 5(3 - 2у) - 4(9 - у) = 3(у + 5),

  15 - 10у - 36 + 4у = 3у + 15,

  -6у - 21 = 3у + 15,

  -6у - 3у = 15 + 21,

  -9у =  36,

  у = 36 : (-9),

  у = -4;

2) 14(2х - 3) - 5(х + 4) = 2(3х + 5) +5х,

   28х - 42 - 5х - 20 = 6х + 10 + 5х,

   23х - 62 = 11х + 10,

   23х - 11х = 10 + 62,

   12х = 72,

   х = 72 : 12,

   х = 6;

3) 9(3х - 7) + 3(8х - 11) = 3(9х + 8),

   27x - 63 + 24x - 33 = 27x + 24,

   51x - 96 = 27х + 24,

   51х - 27х = 24 + 96,

   24х = 120,

    х = 120 : 24,

    x = 5;

4) 6(7х - 11) - 13(х - 6) = 14(2х + 1),

   42х - 66 - 13х + 78 = 28х + 14,

   29х + 12 = 28х + 14,

   29х - 28х = 14 - 12,

    х = 2.