(6х+7)(6х-7)+12х=12х(3х+1)-49
(6x+7)*(6x)+12x=12x*(3x+1)-49 36x²-49+12x=36x+12x-49 36x²-36x=0 I÷36 x²-1=0 x=1 x=-1.
(6x+7)(6x-7)+12x=12x(3x+1)-49 +12x=36x+12x-49 +12x-12x-36x+=0 [tex] 6x^{2} - 36x=0 6x(x-6)=0 6x=0 x-6=0 x=0 x=6