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1/2-5*x-x = -107/2 // + -107/2
1/2-5*x-x-(-107/2) = 0
1/2-5*x-x+107/2 = 0
54-6*x = 0 // - 54
-6*x = -54 // : -6
x = -54/(-6)
x = 9
x = 9
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