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x in (-oo:+oo)
x/3 = 4*((x-30)/5) // - 4*((x-30)/5)
x/3-(4*((x-30)/5)) = 0
(-4/5)*(x-30)+x/3 = 0
x/3-4/5*(x-30) = 0
(-4/5*3*(x-30))/3+x/3 = 0
x-4/5*3*(x-30) = 0
72-7/5*x = 0
(72-7/5*x)/3 = 0
(72-7/5*x)/3 = 0 // * 3
72-7/5*x = 0
72-7/5*x = 0 // - 72
-7/5*x = -72 // : -7/5
x = -72/(-7/5)
x = 360/7
x = 360/7
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