$3x+(-4)=2y+9$
$-9-9$

$\frac{3x}{2}-\frac{13}{2}=\frac{2y}{2}$

$1.5x-6.5=y$

Isolate the variable.

Multiply both sides of the equation by $\frac{7}{6}$.

$(\frac{7}{6})12=\frac{6}{7}x(\frac{7}{6})$

$x=\frac{7}{6}(12)=14$

You can use cross multiplication to solve this equation.

$38 (18) = 6 (x)$

$x=\frac{684}{6}=114$

See part (c).