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2/5-3*x = -37/20 // + -37/20
2/5-3*x-(-37/20) = 0
2/5-3*x+37/20 = 0
9/4-3*x = 0 // - 9/4
-3*x = -9/4 // : -3
x = -9/4/(-3)
x = 3/4
x = 3/4
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