2,8х-3(2х-1)=2,8-3,19х
2,8х-6x+3=2,8-3,19х
-0,01x=<span>−0,2</span>
<span>x=-0,2/(-0,01)</span>
<span>x=20.</span>
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Проверка:
2,8*20-6*20+3=2,8-3,19*20
-61=-61
2,8x-3(2x-1)=2,8-3,19x2.8x-6x+3-2.8+3.19x=0
-3.2x+0.2+3.19x=0
-0.01x+0.2=0
x=-(-0.2)/0.01x=0.2/0.01x=20