$$\left. \begin{array} { l } { 5 ( x - 4 ) - 2 ( x - 9 ) + 5 ( x + 6 ) = 0 } \end{array} \right.$$
$x = -\frac{7}{2} = -3\frac{1}{2} = -3.5$
$$5x-20-2\left(x-9\right)+5\left(x+6\right)=0$$
$$5x-20-2x+18+5\left(x+6\right)=0$$
$$3x-20+18+5\left(x+6\right)=0$$
$$3x-2+5\left(x+6\right)=0$$
$$3x-2+5x+30=0$$
$$8x-2+30=0$$
$$8x+28=0$$
$$8x=-28$$
$$x=\frac{-28}{8}$$
$$x=-\frac{7}{2}$$
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