$-19x+19z+15x-31z$
$-1\cdot\left(6+\left(-6\right)\right)$
$\int\left(2x\sqrt{1+15x^2}\right)dx$
$4a^3b^2-3a^3b^2-a^3b^2+2a^3b^2$
$\int4^{2-3x}dx$
$x^2-120x-3746.9$
$\left(+4\right).\left[\left(-5\right)\:+\:\left(-2\right)\right]$
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