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m in (-oo:+oo)
7*m-35 = (5/2)*m // - (5/2)*m
7*m-((5/2)*m)-35 = 0
7*m+(-5/2)*m-35 = 0
9/2*m-35 = 0 // + 35
9/2*m = 35 // : 9/2
m = 35/9/2
m = 70/9
m = 70/9
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