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x+3/4 = x/2+2/5 // - x/2+2/5
x-(x/2)+3/4-(2/5) = 0
x-(x/2)+3/4-2/5 = 0
1/2*x+7/20 = 0 // - 7/20
1/2*x = -7/20 // : 1/2
x = -7/20/1/2
x = -7/10
x = -7/10
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