Question

решите уравнения
a) 15-x=x-17
b) 18x=-9
c) 8x-9=6x+12
d) -3(x-2)=4(1-x)
e) 2-6(x-1)=3-4(2-x)

Answer 1

а) 15 - х = х - 17,

   -х - х = -17 - 15,

   -2х = -32,

   х = -32 : (-2),

   х = 16;

b) 18х = -9,

    х = -9 : 18,

    х = -0,5;

c) 8х - 9 = 6х + 12,

   8х - 6х = 12 + 9,

   2х = 21,

   х = 21 : 2,

   х = 10,5;

d)  -3(х - 2) = 4(1 - х),

    -3х + 6 = 4 - 4х,

    -3х + 4х = 4 - 6,

    х = -2;

e)  2 - 6(х - 1) = 3 - 4(2 - х),

    2 - 6х + 6 = 3 - 8 + 4х,

    8 - 6х = -5 + 4х,

    -6х - 4х = -5 - 8,

    -10х - -13,

     х = -13 : (-10),

     х = 1,3.