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x in (-oo:+oo)
70 = (1/2)^20*x // - (1/2)^20*x
70-((1/2)^20*x) = 0
70-1/1048576*x = 0 // - 70
-1/1048576*x = -70 // : -1/1048576
x = -70/(-1/1048576)
x = 73400320
x = 73400320
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