exam Maths Puzzle Numerical Ability

I need help on 6r^2+7r=3. I already have 6r^2+7r-3=0. thanks, tyler

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How do you find the equation of a line satisfying the given conditions: Vertical line passing through (2,-7)? really need help on this one!
Find the solution to the equation: (5/x+5)+(x/x+3)+(1/x^2+8x+15) = 0
the choice of answers given are: {-4,-3} {-5,1) (-8,-2} and empty set