1) 3х-6-4х-12=-2х+14
2)3х+2х-4х=14+6+12
3)х=32
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6х^2+5х-20=-9
6х^2+5х-11=0
D=25+264=289
x=(-5+17)/12 х=(-5-17)/12
х=1 х=-22/12