$v-7=-9$
$\sin\left(6x\right)\cdot\sin\left(3x\right)$
$-\left(x+y\right)+\left(-x\:-\:y\right)-\left(-y+x\right)+\left(3x\:+\:y\right)$
$x^2x+9$
$18\:+\:968$
$64y^2b^4+34yb^2+16$
$2\left(m+2\right)+2-7m$
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