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(5/2)*(7*x-15)+(13/2)*x-(3/2) = 0
(5/2)*(7*x-15)+(13/2)*x-3/2 = 0
5/2*(7*x-15)+(13*x)/2-3/2 = 0
(2*5/2*(7*x-15))/2+(13*x)/2-3/2 = 0
2*5/2*(7*x-15)+13*x-3 = 0
48*x-75-3 = 0
48*x-78 = 0
(48*x-78)/2 = 0
(48*x-78)/2 = 0 // * 2
48*x-78 = 0
48*x-78 = 0 // + 78
48*x = 78 // : 48
x = 78/48
x = 13/8
x = 13/8
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