Question

7x^2=(2x+1)^2+3x^2-5

Answer 1

$7x^2=(2x+1)^2+3x^2-5\7x^2=4x^2+4x+1+3x^2-5\7x^2=7x^2+4x-4\-4x=-4|:(-4)\x=1$

Answer 2

4х^2+4x+1+3x^2-5-7x^2=0
4x=4
x=1