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x in (-oo:+oo)
(-1/3)*(x-15) = -48 // + 48
(-1/3)*(x-15)+48 = 0
48-1/3*(x-15) = 0
48-1/3*(x-15) = 0
53-1/3*x = 0
53-1/3*x = 0
53-1/3*x = 0 // - 53
-1/3*x = -53 // : -1/3
x = -53/(-1/3)
x = 159
x = 159
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