y2−9+20y^2-9+20y2−9+20
27x−918x−3\frac{27x^{-9}}{18x^{-3}}18x−327x−9
16x2+16xy+4y216x^2+16xy+4y^216x2+16xy+4y2
2(4+6)−482\left(4+6\right)-482(4+6)−48
7(8)⋅7(−4)7\left(8\right)\cdot7\left(-4\right)7(8)⋅7(−4)
−4c − 2c-4c\:-\:2c−4c−2c
5x2−24x−55x^2-24x-55x2−24x−5
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