Упростите выражения пожалуйста:
1) -8(6а+7в)+4(а-2в)
2) -2•(8х-у)-3•(у+9х)
3)6•(3х-7у)-7•(у-х)
4)3х+2•(2х-3)=8-7(х-2)
5)3•(2х-5)-4х=5•(х-9)+27
6)7•(х-5)-3•(1-2х)=16-3•(2х-1)
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