We begin by factoring both quadratics. We find that the $18x^2+25x-3=0$ factors to: \[ (2x+3)(9x-1)=0. \]Thus, the only values of $x$ that satisfy this equation are $-\frac32$ and $\frac19$. When we factor the second quadratic, $4x^2+8x+3=0$, we find that it is equal to: \[ (2x+1)(2x+3)=0. \]Thus, the only values that satisfy this equation are $-\frac12$ and $-\frac32$. Since $-\frac32$ is the only root both polynomials have in common, the answer must be $-\frac32$
Let $x$ be a number that satisfies both equations $18x^2+25x-3=0$ and $4x^2+8x+3=0$. Find the value of $x$.