Répondre :
1) 5 ( x-1) +2 (4x+3)= 7x
5x - 5 + 8x + 6 = 7x
13x + 1 = 7x
1 = 7x - 13x
1 = -6x
x = -1/6
1) -5 (8x+9)= 3( 7x-3)
-40x - 45 = 21x - 9
-40x + 21x = -9 + 45
-19x = 36
x = -36/19
5x - 5 + 8x + 6 = 7x
13x + 1 = 7x
1 = 7x - 13x
1 = -6x
x = -1/6
1) -5 (8x+9)= 3( 7x-3)
-40x - 45 = 21x - 9
-40x + 21x = -9 + 45
-19x = 36
x = -36/19