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m in (-oo:+oo)
3*(7*m+10) = 198 // - 198
3*(7*m+10)-198 = 0
3*(7*m+10)-198 = 0
21*m-168 = 0
21*m-168 = 0
21*m-168 = 0 // + 168
21*m = 168 // : 21
m = 168/21
m = 8
m = 8
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