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Be careful and make multiplication explicit.

Instead of

de = diff(x, t) == 2 * x(15 - x)

you want

de = diff(x, t) == 2 * x * (15 - x)

Be careful and make multiplication explicit.

Instead The differential equation studied here is $$ x'(t) = 2 · x(t) · (15 - x(t)) $$ and not $$ x'(t) = 2 · x(15 - x(t)) $$ so instead of

de = diff(x, t) == 2 * x(15 - x)

you want

de = diff(x, t) == 2 * x * (15 - x)