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x in (-oo:+oo)
3*(6-(5*x)) = 78 // - 78
3*(6-(5*x))-78 = 0
3*(6-5*x)-78 = 0
3*(6-5*x)-78 = 0
-15*x-60 = 0
-15*x-60 = 0
-15*x-60 = 0 // + 60
-15*x = 60 // : -15
x = 60/(-15)
x = -4
x = -4
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