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m in (-oo:+oo)
m/20 = 900/30 // - 900/30
m/20-(900/30) = 0
m/20-30 = 0
1/20*m-30 = 0 // + 30
1/20*m = 30 // : 1/20
m = 30/1/20
m = 600
m = 600
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