Explications étape par étape :
EX1
7x + 10 = 4x - 3
⇔ 3x = -13
⇔ x = -13/3
2x( 3x - 4 ) = ( 3x - 4 ) ( 2x - 1 )
⇔ 6x² - 8x = 6x² - 3x - 8x + 4
⇔ -3x + 4 = 0
⇔ -3x = - 4
⇔ x = 4/3
2. 7 * (-13/3) + 10 = -91/3 + 10 = -61/3
4 * ( -13/3) - 3 = -52/3 - 3 = -52/3 - 9/3 = -61/3
2*4/3 ( 3 * 4/3 - 4 )
8/3 *0 = 0
( 3 * 4/3 - 4 ) (2 * 4/3 - 1 )
0 * (8/3 - 1 ) = 0
