$-82a^4b^2+84a^4b^2$
$9x-12y$
$-15+2+4-1$
$\left(-2+8\right)-\left(-5-47-102\right)+6$
$12\:-\:\left(-5\right)$
$-2-2^3+1$
$5x-2=4x+7$
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