Requesting for help
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Formula blocks does that: It has 2 operands - left and right. In both you select something that will result in certain values. Between both operands there is mathematical operator +,-,* or /. You select one of them.
If the value of the left operand is 100, the value of the right operand is 200 and the operator is +, then this is what you have:
100 + 200
This results in 300, but where is the result? You must define a Variable first. Then right-click on that "Put the result into this Variable" input field and choose that Variable. The data type of that Variable should be "double".
Then in different block you can use that Variable. But it's not in any list. If you use Condition, go to Value - Numeric, right-click again and select the Variable again.