$$25a^3b^2+35a^2b^5-40a^7b^{10}$$

$$\left(8\cdot7\right)\left(+3\right)\cdot0$$

$$5\tan\left(x\right)\cos\left(x\right)+2=3\sin\left(x\right)+3$$

$$\log\left(x-2\right)+\log\left(x+4\right)=1$$

$$10v^2+80v-90$$

$$\lim_{x\to0}\left(\frac{5sin\left(7x^8\right)}{-3x}\right)$$

$$\left(15\cdot3\cdot6\right):3$$