$\left(-42\right)-\left(-15\right)$
$\left(3x-3\right)\left(-3x+3\right)$
$\int\left(\frac{1}{x}\sin\left(x\right)-\cos\left(x\right)\right)dx$
$\left(6+3i\right)x^2+\left(1-2i\right)x+1-i=0$
$\left(x^3+64\right)-\left(36\right)$
$\log\left(x-2\right)-\log\left(2x-3\right)=0$
$\left(2x+3y\right)^2+10\left(2x+3y\right)+25$
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