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x in (-oo:+oo)
x/30 = 25/100 // - 25/100
x/30-(25/100) = 0
x/30-1/4 = 0
1/30*x-1/4 = 0 // + 1/4
1/30*x = 1/4 // : 1/30
x = 1/4/1/30
x = 15/2
x = 15/2
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