If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
13 = (r/9)*t^8 // - (r/9)*t^8
13-((r/9)*t^8) = 0
13-1/9*r*t^8 = 0
x należy do R
x in (-oo:+oo)
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