$\left(-12+x-3x^2\right)\left(-3x\right)$
$4-1-5$
$45+45+16+25+1+100$
$4x+-5x+6x^2-15$
$\int_2^{3b}2xdx$
$1b^6+x^4a^2+x^2ab^3$
$\left(x+y+3\right)dx\left(1-x\right)dy=0$
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