$\left(x^3+7\right)\left(-x^2+4\right)$
$\left(0.2819740503\right)^{10}-1$
$x^2+x=30$
$-4x\:+\:2y\:=10$
$\frac{\left(2yx4\right)^{-4}}{xy^{-3}}$
$+1x^{15}y.0x^{22}y^{15}$
$\left|-3\right|\cdot\left|-2+8\right|$
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