2(3x+2y)-3(x-2(x+y))=9x+10y

2(3х + 2у) - 3(х - 2(х + у)) = 9х + 10у
6х + 4у - 3(х - 2х - 2у) = 9х + 10у
6х + 4у - 3х + 6х + 6у = 9х + 10у
(6х - 3х + 6х) + (4у + 6у) = 9х + 10у
9х + 10у = 9х + 10у