[tex] - 2a = 1984 - 2000 \\ - 2a = - 16 | \times ( - 1) \\ 2a = 16 \\ a = 16 \div 2 \\ a = 8[/tex]
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2000-a*2=1984
2000-2a=1984
2a=2000-1984
2a=16
a=8
