12-3(7-х)=9-4(х+5)
12-21+3х = 9 - 4х - 20
7х = -2
х = -
4(2х-5)-8=-7+5(4-9х)
8х - 20 - 8 = -7 + 20 - 45х
53х = 41
х =
12-3(7-х)=9-4(х+5)
12-21+3х = 9 - 4х - 20
7х = -2
х = -
4(2х-5)-8=-7+5(4-9х)
8х - 20 - 8 = -7 + 20 - 45х
53х = 41
х =