exam Maths Puzzle Numerical Ability

will you help me to understand how to solve simple equations such as this one: 2x+3=9.x=

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exam Other Question

Factor completely: (a+b)^2-5(a^2-b^2)+4(a-b)^2 In a card game, a hand of 5 cards contains at least 2 spades. What is the probabilitiy that there are exactly 4 spades in this hand?

The answer is 0.0292
Any help would be ap