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x+x-(9/2)+3/5 = 7/2 // - 7/2
x+x-(9/2)+3/5-(7/2) = 0
x+x-9/2+3/5-7/2 = 0
2*x-37/5 = 0 // + 37/5
2*x = 37/5 // : 2
x = 37/5/2
x = 37/10
x = 37/10
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