$4-100x^2$
$\left(-7\right).\left(-6\right).\left(-2\right).1$
$3.9b+8.6b$
$\frac{\left(x-1\right)}{\left(x+2\right)}\ge4$
$\left(-2\right)^4.\left(-2^3\right)$
$3x-4>8$
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