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10*x-(9*x)-(1/2) = -9/10 // + -9/10
10*x-(9*x)-(1/2)-(-9/10) = 0
10*x-9*x-1/2+9/10 = 0
x+2/5 = 0 // - 2/5
x = -2/5
x = -2/5
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