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(1/5)*(2*x-15)+(3/5)*x = 0
1/5*(2*x-15)+(3*x)/5 = 0
(1/5*5*(2*x-15))/5+(3*x)/5 = 0
1/5*5*(2*x-15)+3*x = 0
5*x-15 = 0
(5*x-15)/5 = 0
(5*x-15)/5 = 0 // * 5
5*x-15 = 0
5*x-15 = 0 // + 15
5*x = 15 // : 5
x = 15/5
x = 3
x = 3
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