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m in (-oo:+oo)
7*(2*m+6) = 210 // - 210
7*(2*m+6)-210 = 0
7*(2*m+6)-210 = 0
14*m-168 = 0
14*m-168 = 0
14*m-168 = 0 // + 168
14*m = 168 // : 14
m = 168/14
m = 12
m = 12
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