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