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(5/2)*(7*x-15)+x = (13/2)*x-(3/2) // - (13/2)*x-(3/2)
(5/2)*(7*x-15)+x-((13/2)*x)+3/2 = 0
(5/2)*(7*x-15)+x+(-13/2)*x+3/2 = 0
5/2*(7*x-15)+x+(-13*x)/2+3/2 = 0
(2*5/2*(7*x-15))/2+(2*x)/2+(-13*x)/2+3/2 = 0
2*5/2*(7*x-15)+2*x-13*x+3 = 0
37*x-13*x-75+3 = 0
24*x-75+3 = 0
24*x-72 = 0
(24*x-72)/2 = 0
(24*x-72)/2 = 0 // * 2
24*x-72 = 0
24*x-72 = 0 // + 72
24*x = 72 // : 24
x = 72/24
x = 3
x = 3
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