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x in (-oo:+oo)
x/5 = 180/45 // - 180/45
x/5-(180/45) = 0
x/5-4 = 0
1/5*x-4 = 0 // + 4
1/5*x = 4 // : 1/5
x = 4/1/5
x = 20
x = 20
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