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Define a string containing variables and expressions

Given variables a=3 and b=4 output "3+4=7"
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groovy
println "$a+$b=${a+b}"
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groovy
printf "%d+%d=%d\n", a, b, a + b
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erlang
A = 3, B = 4,
io:format("~B+~B=~B~n", [A, B, (A+B)]).
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fantom
echo("$a+$b=${a+b}")

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