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(1/5)*(2*x-15)+(3/5)*x = 4.25 // - 4.25
(1/5)*(2*x-15)+(3/5)*x-4.25 = 0
1/5*(2*x-15)+(3*x)/5-4.25 = 0
(1/5*5*(2*x-15))/5+(3*x)/5+(-4.25*5)/5 = 0
1/5*5*(2*x-15)+3*x-4.25*5 = 0
5*x-21.25-15 = 0
5*x-36.25 = 0
(5*x-36.25)/5 = 0
(5*x-36.25)/5 = 0 // * 5
5*x-36.25 = 0
5*x-36.25 = 0 // + 36.25
5*x = 36.25 // : 5
x = 36.25/5
x = 7.25
x = 7.25
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