$-0.23d+d+0.77d$
$7x-2\:para\:x=1$
$9y-15x+10+3y+6x$
$-42\:+4\:+\:-15$
$\int\frac{s}{s^2+2s-3}dx$
$16x+10y-240$
$y=\cot\left(2x^3+4x^2+2x\right)$
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