Bonjour
a.
[tex]3x - 15 = 9x + 4 \\ - 15 - 4 = 9x - 3x \\ - 19 = 6x \\ \frac{ - 19}{6} = x[/tex]
b.
[tex]5(x + 3) = 2x - 3 \\ 5x + 15 = 2x - 3 \\ 5x - 2x = - 3 - 15 \\ 3x = - 18 \\ x = - 6[/tex]
c.
[tex] - 2(2x - 4) = 6x - ( - 3 + x) \\ - 4x + 8 = 6x + 3 - x \\ - 4x + 8 = 5x + 3 \\ 8 - 3 = 5x + 4x \\ 5 = 9x \\ \frac{5}{9} = x[/tex]
