$a+b-c+d,a=2,b=1,c=\frac{1}{4}\:d=\frac{1}{2}$
$\left(-8\right)\:+\:\:\left(-15\right)\:+\:\left(-\:10\right)\:+\:6\:-\:\:\left(-\:4\right)\:=\:$
$c^2\left(c^2-10c+25\right)$
$\left(18\right)\left(4\right)+\left(18\right)\left(-2\right)\left(11\right)$
$\log\left(x\right)=\log\left(x-3\right)+\log\left(2\right)$
$\frac{3}{2}\:x-1>\frac{1}{4}\:-7x\:$
$\sin\left(x\right)=\frac{1-\cos\left(x\right)^2}{1+\sin\left(x\right)}$
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