$-\left(v-5\right)-3v\left(v+1\right)$

$\left(x^2y\right)\left(x^3y^4\right)=x^5y^5$

$x-1+6x^4+3x^2-\left(3x^2-4x^4-9x\right)$

$-3+-4b-6b+-8b+-1$

$\frac{12}{7}m+\frac{5}{7}\:.\:2m-5$

$\frac{4x^5-6x^7+10x^9}{2x^3}$

$2\sin\:\left(x\right)\cdot\:\cos\:\left(x\right)-\left(\sin\:\left(x\right)+\cos\:\left(x\right)\right)^2$