$23-4-4+45$
$-5\left(t+1\right)^2$
$2 x ( 4 y ) + 6 z$
$\int\frac{\left(x+2\right)^2}{x+1}dx$
$\int\left(2x\sin\left(1-x^2\right)\right)dx$
$4x^2+28x+45=0$
$3x-5=2x-7$
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