Question

решите уравнение 1)20-4x=8(3x+2,5)-28x 2)4x+9=5(2x-7)-6x

Answer 1

1)20-4х=8(3х+2,5)-28х             2)4х+9=5(2х-7)-6х
  20-4х=24х+20-28х                     4х+9=10х-36-6х                      
  20-4х= -4+20                              4х+9=4х-36
  20-20=-4х+4х                              9+36=4х+4х
   х=0                                             х=5,625