exam Maths Puzzle Numerical Ability

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Factor
12m-12n+108
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exam Other Question

Please help me reduce this equation: {{ 5x-[-3x-(-2y+5x)-(10x-3y-4x)] }}}

And there is a bar above the 3y-4x In his coin collection of dimes and quarters, Quang has 168 coins. If the collection has a value of $30. how many coins are dimes? how many are quarters?