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3*x+7/2 = 8.2 // - 8.2
3*x+7/2-8.2 = 0
3*x-4.7 = 0 // + 4.7
3*x = 4.7 // : 3
x = 4.7/3
x = 1.56666667
x = 1.56666667
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