$\int7\sin\left(-2x\right)dx$
$-4x>12$
$6x+\:\left(x\:+2z\right)-\left(x+z\right)$
$3\cdot\left(-1.45\right)^2+3\left(-1.45\right)-2$
$x^2+3x-1$
$x^2-\left(25-x\right)^2=25$
$-2\cdot\sin^2\left(x\right)+7\cdot\sin\left(x\right)-3=0$
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