$\frac{5x-5}{x+1}=3$
$81x^2+49x^2$
$33.50x+27y+13z=175$
$\cos^4\left(x\right)-\sin^4\left(x\right)+1=2$
$\left(6x+8y\right)\left(6x-3y\right)$
$0,52+0,27$
$\left(-108\right):\left(-12\right)$
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