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m in (-oo:+oo)
7*(5*m-6) = -7 // + 7
7*(5*m-6)+7 = 0
7*(5*m-6)+7 = 0
35*m-35 = 0
35*m-35 = 0
35*m-35 = 0 // + 35
35*m = 35 // : 35
m = 35/35
m = 1
m = 1
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