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0.75*x = 15/2 // - 15/2
0.75*x-(15/2) = 0
0.75*x-15/2 = 0
0.75*x-15/2 = 0 // + 15/2
0.75*x = 15/2 // : 0.75
x = 15/2/0.75
x = 10
x = 10
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