7(-5+3х)+4х=9
3(-1-х)-2х=9
6(4-х)+3х=3

7(-5+3х)+4х=9-35+21x+4x=925x=9+3525x=44x=44:25x=1,76===========3(-1-х)-2х=9-3-3x-2x=9-5x=9+3-5x=12x=12:(-5)x=-2,4========= 6(4-х)+3х=3 24-6x+3x=3-3x=3-24-3x=-21x=21:3x=7

3)6(4-х)+3х=324х-6х+3х=321х=3х=71)7(-5+3х)+4х=9-35+21x+4x=925x=9+3525x=44x=44:25x=1,76