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(21/3)*x+(52/3)*x-9.5+10 = 12.5 // - 12.5
(21/3)*x+(52/3)*x-12.5-9.5+10 = 0
73/3*x-12 = 0 // + 12
73/3*x = 12 // : 73/3
x = 12/73/3
x = 36/73
x = 36/73
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