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9*(x-(9/10))+10*x = 0
9*(x-9/10)+10*x = 0
9*(x-9/10)+10*x = 0
19*x-81/10 = 0
19*x-81/10 = 0
19*x-81/10 = 0 // + 81/10
19*x = 81/10 // : 19
x = 81/10/19
x = 81/190
x = 81/190
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