$\frac{4x^2}{9}-6x^2+14$
$7x\:+\:-\:4\:+\:6y\:-\:2x\:-\:8y$
$1+2+3+1+2+3$
$\left(2x+3y\right)^2-\left(3x+2y\right)^2$
$\frac{k}{2k+1}+\frac{1}{\left(2k+1\right)\left(2k+3\right)}$
$-20y+90z=-440$
$\frac{x^4}{x^2}+\left(x^2\right)^2;x=3$
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