book Maths Puzzle Numerical Ability

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-2/3(6/5-7/10)=17/20

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book Other Question

The first side of a triangle is 8 meters shorter than the second side. The third side is 4 times as long as the first side. The perimeter is 26 meters. Find the length of each side. please help solve

a over a+1 + 2a+4 over a^2-3a-4 = 2 over a-4
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