$-71a^3b-84a^4b^2+50a^2b+84a^4b^2-45a^3b$
$6x+5+9x$
$\left(x+5\right)+x^2-\left(15-x\right);x=5$
$73\cdot73$
$-3x^2-27$
$-5xy+4xy$
$\frac{1}{7}+\frac{6}{7}$
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