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(1/2)*(30*x+10)-(6*(x-2)) = 28 // - 28
(1/2)*(30*x+10)-(6*(x-2))-28 = 0
(1/2)*(30*x+10)-6*(x-2)-28 = 0
1/2*(30*x+10)-6*(x-2)-28 = 0
1/2*(30*x+10)-6*(x-2)-28 = 0
9*x-28+17 = 0
9*x-11 = 0
9*x-11 = 0
9*x-11 = 0 // + 11
9*x = 11 // : 9
x = 11/9
x = 11/9
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