Question

Помогите, пожалуйста

Answer 1

$(x-4)(x-5)(x-6)=(x-4)(x-5)(x-7)\\\\\underline {(x-4)(x-5)}\cdot (x-6)-\underline {(x-4)(x-5)}\cdot (x-7)=0\\\\(x-4)(x-5)\cdot (x-6-x+7)=0\\\\(x-4)(x-5)\cdot 1=0\\\\x-4=0\; \; \; ili\; \; \; x-5=0\\\\\underline {x=4\; \; \; ili\; \; \; \; x=5} \; \; -\; \; otvet$