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m in (-oo:+oo)
m/7 = 3/4 // - 3/4
m/7-(3/4) = 0
m/7-3/4 = 0
1/7*m-3/4 = 0 // + 3/4
1/7*m = 3/4 // : 1/7
m = 3/4/1/7
m = 21/4
m = 21/4
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