(2x-1)(2x+1)+3(x+2)(x-2)=(7x-1)(x+1)怎么算?

问题描述:

(2x-1)(2x+1)+3(x+2)(x-2)=(7x-1)(x+1)怎么算?

展开计算,左面=7x^2-13,右面=7x^2+6x-1
整理6x=-12,
x=-2