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4.3*x+3/10 = 13.2 // - 13.2
4.3*x+3/10-13.2 = 0
4.3*x-12.9 = 0 // + 12.9
4.3*x = 12.9 // : 4.3
x = 12.9/4.3
x = 3
x = 3
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