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M in (-oo:+oo)
M/5.2 = 7/5.2 // - 7/5.2
M/5.2-(7/5.2) = 0
M/5.2-1.34615385 = 0
0.19230769*M-1.34615385 = 0 // + 1.34615385
0.19230769*M = 1.34615385 // : 0.19230769
M = 1.34615385/0.19230769
M = 7.0000001
M = 7.0000001
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