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x in (-oo:+oo)
(1/5)*(60-(15*x))+(3/4)*(12-(24*x)) = 0
(1/5)*(60-15*x)+(3/4)*(12-24*x) = 0
1/5*(60-15*x)+3/4*(12-24*x) = 0
1/5*(60-15*x)+3/4*(12-24*x) = 0
21-21*x = 0
21-21*x = 0
21-21*x = 0 // - 21
-21*x = -21 // : -21
x = -21/(-21)
x = 1
x = 1
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