Répondre :
7+4x-(-2+3x)
=7x²+4x+2x²-3x
=9x²+x
-6x(2x-3)
=-12x²+18x
2(x+3)-3(5-3x)
=2x+6-15+9x
=11x-9
=7x²+4x+2x²-3x
=9x²+x
-6x(2x-3)
=-12x²+18x
2(x+3)-3(5-3x)
=2x+6-15+9x
=11x-9