$12+7+8-\left(5-2-7+4-3\right)-5+9-\left(12-7+8-9-4\right)+8$
$3k+5=20$
$60s^2-85s-35=0$
$3x^5\left(7-2x\right)^7$
$x^2+6x-91=-y^2$
$-7=v-7$
$6x+3y\:-2x\:-y\:-y$
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