book Maths Puzzle Numerical Ability

how do I solve this equation for x 5xsquared +3x -4 = 0

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i have to use linear equations of the form ax + b = cx + d to solve real-world problems!!!!! but i dont get this one problem it says Downtown deli normally charges 5 cents for an o find four consecutive odd integers such that sum of the second integer and twice the fourth integer is 65