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Using variable expressions

Problem

This program draws a rectangle based on the variables w (for width) and h (for height):
var w = 10;
var h = 50;
rect(200, 200, w, h);
Let's say we want to make h dependent on w, so that if we ever change the value of w, the value of h will change proportionately, so that h is always 5 times as large as w. What expression should h hold?
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