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7*x-(2/(-4)) = -10 // + 10
7*x-(2/(-4))+10 = 0
7*x+1/2+10 = 0
7*x+21/2 = 0 // - 21/2
7*x = -21/2 // : 7
x = -21/2/7
x = -3/2
x = -3/2
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