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m in (-oo:+oo)
3*(4-6*m) = 210 // - 210
3*(4-6*m)-210 = 0
3*(4-6*m)-210 = 0
-18*m-198 = 0
-18*m-198 = 0
-18*m-198 = 0 // + 198
-18*m = 198 // : -18
m = 198/(-18)
m = -11
m = -11
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