(3х-1)^2+(4х+5)^2=(5х-7)^2
9x^2-6x+1+16x^2+40x+25=25x^2-70x+49 -6x+1+40x+25=-70x+49 104x=23 x=23:104
9x²-6x+1+16x²+40x+25-25x²+70x-49=0 104x=23 x=23/104