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M in (-oo:+oo)
(1/2)*M+7+34 = 45 // - 45
(1/2)*M-45+7+34 = 0
1/2*M-4 = 0 // + 4
1/2*M = 4 // : 1/2
M = 4/1/2
M = 8
M = 8
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