$-6\sin\left(2x\right)-4cos\left(x\right)=0$
$-50+65-1.600$
$6.4-7-2.9r$
$\left(-9\right)\cdot\left(-3\right)\cdot3$
$4x^2-6x-27$
$9r^2\:+\:3r\:-\:20$
$4x^2-20x-24y=-97$
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