exam Maths Puzzle Numerical Ability

Solve for x:

x^2+5x=6(x+2)

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exam Other Question

6y + 8x = -432

i dont know how to find the x int. and the y int. or the slope in this problem you want 100 gal. 14% solution. How much 8% solution must be mixed with how much 16% solution to get 100 gals of 14%