$x+3xy-6x+8xy+y-2xy$
$\left(\frac{5}{4}.-\frac{1}{3}\right)^2$
$a^2-22a+121$
$-\left(-24\right)+38+-\left(19+61+\left(-42\right)\right)-111$
$\frac{cos\:x+sin\:x}{cos\:x-sin\:x}=\frac{1+sin\:2x}{cos\:2x}$
$-15xy+-18xy+21xy$
$y=\sqrt[4]{x^5}+x$
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