book Maths Puzzle Numerical Ability

find four consecutive odd integers such that sum of the second integer and twice the fourth integer is 65

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book Other Question

simplify 3.2a - 5.6b + 6a - 4.3b can you please really help me with this question.. it will really help me alot..
solve by any method.
-2x+10=0
2x-2y=6