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x in (-oo:+oo)
(-1/3)*(x-15) = -4 // + 4
(-1/3)*(x-15)+4 = 0
4-1/3*(x-15) = 0
4-1/3*(x-15) = 0
9-1/3*x = 0
9-1/3*x = 0
9-1/3*x = 0 // - 9
-1/3*x = -9 // : -1/3
x = -9/(-1/3)
x = 27
x = 27
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