1)При Каком значении х значения выражения 7х-2 и 3х+6 равны?
2) 10(х-9)=7
3) 8-5(2х-3)=13-6х
4) 9-2(-4х+7)=7
5) -х-2+3(х-3)=3(4-х)-3
6) 8+5(2х-3)=13-6х
7) -4+х/5=х+4/2
8) 2х²-х-1=х²-5х-(-1-х²)
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