7а(5а-3b)-10a+6b=7a(5a-3b)-2×(5a-3b)=(5a-3b)(7a-2)
7a(5a-3b)-10a+6b =
7a(5a-3b)-2(5a-3b)=
(7a-2)(5a-3b);
7а(5а-3b)-10a+6b=7a(5a-3b)-2×(5a-3b)=(5a-3b)(7a-2)
7a(5a-3b)-10a+6b =
7a(5a-3b)-2(5a-3b)=
(7a-2)(5a-3b);