Simplify: 2a - (-a) + 4a - 5a

Simplify and Collect Like Terms: 4(a 2 - 3a - 4) ...

Simplify \left(\frac{3}{2 x^{2}}\right)^{2}\left(\frac{6 x^{3}}{5^{2}}\right)\left(-\frac{x^{4}}{5}\right)^{-1}

Perform the Operation Indicated and Collect Like Terms \(\frac{4 a^{2} b^{3}-6 ...

Simplify \left(-\frac{2 x^{2}}{3}\right)^{-2}\left(\frac{5^{2}}{6 x^{3}}\right)\left(-\frac{15}{x^{5}}\right)^{-1}