$\left(+50\right):\left(+2\right)\cdot\left(-4\right)$
$7\cdot\left(-2\right)^4+5\left(-2\right)^3-\left(-2\right)^2+1$
$\left(12y^2+12\right)dx+8xydy=0$
$-36:\:6\:+\:4\cdot\left(-3\right)$
$-\left[7-\left(-6+5\right)-8+\left(2+5\right)\right]+6$
$-2x+8=18$
$3\:x\:\left(-3\right)$
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