решите уравнение 1) (x -5)^2 +4x = 25 2)(x6)(x7) = -x

1) (х-5)+4х=25                       3)6х(0,5+3х)-15х=0
    х-10х+25+4х-25=0                3х+18х-15х=0
    х-6х=0                                     3х+3х=0
   х(х-6)=0                                      3х(1+х)=0
  х=0    х-6=0                                  3х=0         1+х=0
             х=6                                       х=0           х=-1


4)     (4-х)(4+х)=х-2
        16-4х+4х-х-х+2=0
            -2х+18=0
             -2х=-18
                х=9
                х=3