Bonsoir,
-5x-2x= -7-14
-7x= -21
x= -21/-7
x= 3
-6x+3= 3x+12
-6x-3x= 12-3
-9x= 9
x= -9/9
x= -1
S= { -1 }
4x/3= 3/2+3/4
4x/3= (3*2+3)/4
4x/3= 9/4
4(4x)= 3(9)
x= 27/16
S= { 27/16 }
6x²-169= 0
6x²-13²= 0
(6x-13)(6x+13)= 0
6x-13= 0 ou 6x+13= 0
x= 13/6 x= -13/6
S= { -13/6 ; 13/6
6-9x-x-1= 2x+2
-10x+5-2x= 2
-12x= 2-5
x= -3/-12
x= 1/4
S= { 1/4 }