$2x+7=5x+1$
$-4\left(3\right)-7$
$\left(x^4-16\right)\cdot\left(x^4-2\cdot x^2+1\right)$
$\frac { n ^ { 4 } + 2 n ^ { 3 } + n ^ { 2 } } { 4 }$
$1-3\left(\infty\right)\cdot\frac{1}{\infty^2}$
$23,5-12,08$
$5x-7^2$
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