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x in (-oo:+oo)
x/45 = 5/3 // - 5/3
x/45-(5/3) = 0
x/45-5/3 = 0
1/45*x-5/3 = 0 // + 5/3
1/45*x = 5/3 // : 1/45
x = 5/3/1/45
x = 75
x = 75
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