$\left(3y+6\right)-\left(4y+2\right)$
$m^2-6mn+13mn-16$
$\int x\left(x^3-7\right)dx$
$\int\sin\left(6x^2+9x-2\right)\left(4x+3\right)dx$
$3-\left(4-3\left(2-3\left(2+1\right)-2\right)-4\right)$
$98+\left(-1\right)$
$x^2+4x-1=0$
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