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I have forgot how to make a variable have a random value between two specific numbers (for example between -10 and +80)

I once knew it, but I got somehow confused and...
=D

Use a code like this:

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random = minvalue + rand(maxvalue);

In your case:

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random = -10 + rand(80);

kthx, makslane

Also like this...(if you wanna make random angle between -10 to 80)

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my_angle=rand(90);
angle=-10+my_angle;

it means, if you get 0 of my_angle, your angle would be -10, and if you get 90 of my_angle, your angle would be 80
(just another variation)

oh, yeah, sure