5х=3х-7 4х-2=6х=5 10х-7=х-5 х-5=3х=10 7-х=10х+20 10-х=7х+10 2х+5=4х-3 х+20=-х-30 20х+10=21х-31 х+4=2х-31 2х-7+4(х+30=7х-2(х-3)    буду вдячна))))                                            
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