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3.5*x-1 = (-1/2)*(2-7) // - (-1/2)*(2-7)
3.5*x-((-1/2)*(2-7))-1 = 0
3.5*x+(1/2)*(2-7)-1 = 0
3.5*x-7/2 = 0 // + 7/2
3.5*x = 7/2 // : 3.5
x = 7/2/3.5
x = 1
x = 1
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