$3x-7+7x-6-6x$
$y^2+3y-13$
$\cot e+\frac{\sin e}{1+\cos e}=\csc e$
$4a^2-12ad+9a^2$
$5a^2-7a^3+15a^6-8a^3-13a^2$
$3\cdot3.141$
$-4x=-12$
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