(2x - 1)² = 49

(2x-1)²=49
(5x-3)²-(4x-7)²=0
(2x+7)²=9(x+2)²
(x+2)²=9(x²-4x+4)
4(2x+7)²-9(x+3)²=0
(5x²-2x+10)²=(3x²+10-8)²