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(2/3)*x+(5/6)*x = 1/2+10 // - 1/2+10
(2/3)*x+(5/6)*x-(1/2)-10 = 0
(2/3)*x+(5/6)*x-1/2-10 = 0
3/2*x-21/2 = 0 // + 21/2
3/2*x = 21/2 // : 3/2
x = 21/2/3/2
x = 7
x = 7
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