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10*x-(15/2) = 75 // - 75
10*x-(15/2)-75 = 0
10*x-15/2-75 = 0
10*x-165/2 = 0 // + 165/2
10*x = 165/2 // : 10
x = 165/2/10
x = 33/4
x = 33/4
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