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m in (-oo:+oo)
7*(m/7+2) = -3*7 // + -3*7
7*(m/7+2)-(-3*7) = 0
7*(m/7+2)+21 = 0
7*(1/7*m+2)+21 = 0
7*(1/7*m+2)+21 = 0
m+35 = 0
m+35 = 0
m+35 = 0 // - 35
m = -35
m = -35
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