$8-4-6-9+14-12+15-49$
$xy+2y=4x^2$
$\int0.2\left(x+1\right)dx$
$4x^2-14\cdot2x+49$
$x'=\left(x^2-x+1\right)$
$fb=n$
$t^2+17t+72$
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