book Maths Puzzle Numerical Ability

1. Solve the equation: 4(2x-3)=6-(3-2x)

2. Solve: 0=3/18y-18

3. 4y2-49

4. simplify: (-5d5 ef2)exponent2

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your chemistry teacher empties his dehumidifier tank once a day. if the capacity of the tank is 2.0 gallons, determine how many molecules of water the dehumidifier collects from th this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y)