$\int\left(2x\:in\:2x\right)dx$
$\left(-123\right)+32-\left(-45\right)-\left(-41\right)$
$z+4\cdot\left(z+4\right)$
$\left(-3x^5y^6z\right).\left(-2x^2y^6z^2\right)$
$5x-4x+18=3x+2$
$36nu^2-72n^2+60nu$
$\left(6.67+1.2\right).2.23$
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