book Maths Puzzle Numerical Ability

2(x - 1) = 3(x + 1)

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simiplify formula
Rt=1/1/r1+1/r2 A ladder 12 feet long rests against a wall of a house. the foot of the ladder is on level ground 2 feet from the wall. to the nearest hundreth, what is the measurement of th angle formed between the ladder and the ground ?