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x in (-oo:+oo)
5*(4/5-(3*x)) = 15 // - 15
5*(4/5-(3*x))-15 = 0
5*(4/5-3*x)-15 = 0
5*(4/5-3*x)-15 = 0
-15*x-11 = 0
-15*x-11 = 0
-15*x-11 = 0 // + 11
-15*x = 11 // : -15
x = 11/(-15)
x = -11/15
x = -11/15
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