Powershell variables not written correctly -

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so in powershell script have 2 variables getting multiplied each other, there 1 problem, powershell can't tell want multiply variables each other. script below:

$answer = $a*$equation

the $a variable 7. $equation variable 365*675/54 want script 7*365*675/54 , set answer $answer variable.

when debug script says problem in * symbol. can here?

i use invoke-expression instead of running powershell instance.

$answer = invoke-expression "$a*$equation"

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