$2.5+4$
$2x+y=90$
$v+4y-2y+5v$
$10+\:-9\:+\:\frac{-90}{5}$
$z=\left(x+2\right)^{\left(2\right)}+\left(x+3\right)^{\left(2\right)}-2x\left(x+5\right)$
$\int x^2\cos\left(x\right)d\left(x\right)$
$\frac{10a^{2}b^{9}}{15a^{5}b^{9}}$
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