prove that 2^30+2^29+2^28÷2^31+2^30_2^29=7/10
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=> 2^30+2^29+2^28 / 2^31+ 2^30 - 2^29
=> 2^28(2^2+ 2^1+2^0)/2^28(2^3+2^2-2^1)
=> (4+2+1)/(8+4-2)
=> 7/10
hence, proved
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