bonjour,
(x-7)/3 = (2x+1)/2
2(x-7) = 3(2x+1)
2x-14 = 6x+3
2x-6x = 3+14
-4x = 17
x =-17/4
x²+169-26x=0 (
= x²-26x+169 = (a-b)² =
(x-13)²= 0
x =13
(25x-1)²=25
(25x-1)²-25 = 0
= a²-²b =(a-b)(a+b)
(25x-1-5)(25x-1+5) = 0
(25x-6)(25x+4) = 0
finis
(1-5x)(5+x)=(x+5)²
(1-5x)(5+x)-(x+5)² = 0
(5+x)(1-5x-x-5) = 0
(5+x)(6x-4) =0
2(5+x)(3x-2) = 0
finis