$b-23=43$
$\left(x^4-4x^3+7\right)\left(-3x^4-5x^3\right)$
$\left(2x+3\right)\pi$
$93.5\cdot1000$
$-8\left(-4y^3-2+4u^2\right)$
$-15z\:=-225$
$4m^{6-9}$
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