x=3 y=4 let z=$x+$y echo $z # 7
$x = 3; $y = 4; $z = $x + $y; echo $z; # 7
x = 3 y = 4 z = x + y print z # 7
x = 3 y = 4 z = x + y print( z ) ## [1] 7
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