$ac+bc+ad+bd$
$\left(-47\right).\left(-60\right)$
$8-7+2+5$
$\frac{\left(2\cdot x^2-x\right)}{\left(-x+1\right)}$
$4\left(6^1\right)$
$3x^2-6x-10$
$x^2-8x-10y=34$
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