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-2*x-(9/10) = -189/10 // + -189/10
-2*x-(9/10)-(-189/10) = 0
189/10-2*x-9/10 = 0
18-2*x = 0 // - 18
-2*x = -18 // : -2
x = -18/(-2)
x = 9
x = 9
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