$$-8=x+7$$

$$\left(7a^2b^3+5x^2\right)^2$$

$$\left(-11a+15b\right)\left(11a+15b\right)$$

$$_{\left(2-x\right)-3\left(6+8x\right)-12}$$

$$6\cos^{2}x+17\cos x+7$$

$$\frac{v^{\frac{1}{2}}}{v^{\frac{5}{8}}}$$

$$6.1+-8.8$$