7,000,000,000 (7 billion) - 1 = 6,999,999,999
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7 billion minus 5 million is 6,995,000,000
7 billion minus 900 million = 6,100,000,000
7 billlion minus 200 million is 6 billion 800 million (6,800,000,000).
-7
X - 7 = 11 X = 11+7 therefore X = 18 18 minus 7 equals 11.