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Area = 0.5*AB*BC*sin(ABC)

= 0.5*(2x+1)*(x+2)*0.5 = 3

So, (2x+1)*(x+2) = 12

2x2 + 5x + 2 = 12

2x2 + 5x - 10 = 0

x = 1.31 (to 3 sf)

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