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x in (-oo:+oo)
x/28 = 35/135 // - 35/135
x/28-(35/135) = 0
x/28-7/27 = 0
1/28*x-7/27 = 0 // + 7/27
1/28*x = 7/27 // : 1/28
x = 7/27/1/28
x = 196/27
x = 196/27
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