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(2/5)*(x-10)+(2/5)*x = 16 // - 16
(2/5)*(x-10)+(2/5)*x-16 = 0
2/5*(x-10)+(2*x)/5-16 = 0
(2/5*5*(x-10))/5+(2*x)/5+(-16*5)/5 = 0
2/5*5*(x-10)+2*x-16*5 = 0
4*x-80-20 = 0
4*x-100 = 0
(4*x-100)/5 = 0
(4*x-100)/5 = 0 // * 5
4*x-100 = 0
4*x-100 = 0 // + 100
4*x = 100 // : 4
x = 100/4
x = 25
x = 25
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