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(1/2)*(30*x+10)-(60*(x-2)) = 28 // - 28
(1/2)*(30*x+10)-(60*(x-2))-28 = 0
(1/2)*(30*x+10)-60*(x-2)-28 = 0
1/2*(30*x+10)-60*(x-2)-28 = 0
1/2*(30*x+10)-60*(x-2)-28 = 0
125-45*x-28 = 0
97-45*x = 0
97-45*x = 0
97-45*x = 0 // - 97
-45*x = -97 // : -45
x = -97/(-45)
x = 97/45
x = 97/45
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