1610
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1992
Multiply by 0.80. Example: 200 x 0.80= 160.
1770
240/x = 160/x -20 Multiply all terms by x: 240 = 160 -20x Subtract 160 from both sides: 80 = -20x Divide both sides by -20 to find the value of x: x = -4
MDCCLXX = 1770