1) (изначальный пример)
12х-4-12+2х = 5-5х-3х+15
12х+2х+5х+3х = 5+15+4+12
22х = 36
х = 36/22
х = 18/11
2) (изначальный пример)
2х+3 = 2/9х+14/9
2х-2/9х = 14/9-3
16х = -13
х = -13/16
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Answers & Comments
1) (изначальный пример)
12х-4-12+2х = 5-5х-3х+15
12х+2х+5х+3х = 5+15+4+12
22х = 36
х = 36/22
х = 18/11
2) (изначальный пример)
2х+3 = 2/9х+14/9
2х-2/9х = 14/9-3
16х = -13
х = -13/16