[tex]bonjour\\\\\\5 ( x - 3 ) = 5 x - 15 \\\\( 4 + 5 y) * 8 = 32 + 40 y \\- 4 ( 10 - 20) = - 40 + 80 = 40 \\10 ( 5 - 2 f + 65) = 50 - 20 f + 650 = - 20 f + 600 \\5 ( x - 9 ) + 2 ( x + 3) = 5 x - 45 + 2 x + 6 = 7 x - 39 \\\\7 x^{2} + 7 x - 28 + 18 x^{2} - 45 x - 18 \\= 25 x^{2} - 38 x - 46 \\\\[/tex]