$\left(7+7x\right)^{\frac{2}{x}}$
$14x-2=3x-2$
$\left(x+3y+4z\right)^2$
$\int\:\left(1+5x\right)x^3dx$
$\left(3x+6\right)\left(3x+47\right)$
$-5+1\left(-4\right)+1\left(-3\right)-1\left(-7\right)$
$3x^2-15$
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