$j+j+k+j+j+i+h+i+h-k$
$3x+5y=50$
$\frac{2}{5}x+\frac{6}{5}=-\frac{2}{5}$
$\left(a+b+c\right)\:x\:d$
$y=x^2-2x^{-1}$
$\log_a\left(mn\right)=\log_a\left(m\right)+\log_a\left(n\right)$
$4x^2y-3y+1=x^3$
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