$3x=180$
$-0,23+0,2$
$a^3b+2a^2bx-abx^2-aby^2$
$\:x^2\:-\:5x\:+\left(-5\right)^2$
$x^3+y+3x^2y=y$
$x^2-155x+2800$
$\left(4a^2-5\right)^2$
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