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)
f = (9/5)*c // - (9/5)*c
f-((9/5)*c) = 0
(-9/5)*c+f = 0
f-9/5*c = 0
x należy do R
x in (-oo:+oo)
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