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)
Y = (5/4)*c-3 // - (5/4)*c-3
Y-((5/4)*c)+3 = 0
Y+(-5/4)*c+3 = 0
Y-5/4*c+3 = 0
x należy do R
x in (-oo:+oo)
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