$7y-8\cdot7y+8$
$\int_0^1\left(\sin^2\left(\pi y\right)\cos^2\left(\pi y\right)\right)dy$
$\left(3y^4-5y^2\right)^2$
$13x+18-3x$
$9s\:-\:6s\:+\:3r$
$x+30x+25$
$n^2-17=-2n$
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