$\left(7x+13\right)+\left(5x+12\right)+\left(x^2+11\right)$
$3y^4-2x^3y+4x^3-5y^4x+3;\:x=1;y=-3$
$\log\left(x\right)=log6+log\left(x+1\right)$
$x^2<9$
$4+\left(-2\right)-\left(-7\right)-6+\left(+1\right)$
$3\left(1\right)^2-21\left(1\right)+30$
$3^2-2x+1$
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