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(1/5)*(60-(15*x))+(3/4)*(12-(4*x)) = 0
(1/5)*(60-15*x)+(3/4)*(12-4*x) = 0
1/5*(60-15*x)+3/4*(12-4*x) = 0
1/5*(60-15*x)+3/4*(12-4*x) = 0
21-6*x = 0
21-6*x = 0
21-6*x = 0 // - 21
-6*x = -21 // : -6
x = -21/(-6)
x = 7/2
x = 7/2
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