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0.8*3*x = 3/4 // - 3/4
0.8*3*x-(3/4) = 0
0.8*3*x-3/4 = 0
2.4*x-3/4 = 0 // + 3/4
2.4*x = 3/4 // : 2.4
x = 3/4/2.4
x = 0.3125
x = 0.3125
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