12+4( х-3 ) -2х= ( 5-3х) +9
12+4x-12-2x=5-3x+9
4x-2x+3x=-12+12+5+9
5x=14
x=14:5
x=2.8
Ответ: 2.8
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12+4( х-3 ) -2х= ( 5-3х) +9
12+4x-12-2x=5-3x+9
4x-2x+3x=-12+12+5+9
5x=14
x=14:5
x=2.8
Ответ: 2.8