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M in (-oo:+oo)
1 = (2*M)/3+7 // - (2*M)/3+7
1-((2*M)/3)-7 = 0
(-2/3)*M-7+1 = 0
-2/3*M-6 = 0 // + 6
-2/3*M = 6 // : -2/3
M = 6/(-2/3)
M = -9
M = -9
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