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x in (-oo:+oo)
a*((4*x)/5) = c // - c
a*((4*x)/5)-c = 0
4/5*a*x-c = 0 // + c
4/5*a*x = c // : 4/5*a
x = c/(4/5*a)
x = 5/4*a^-1*c
x = 5/4*a^-1*c
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