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m in (-oo:+oo)
7-4*m = 3*m-70 // - 3*m-70
7-4*m-(3*m)+70 = 0
7-4*m-3*m+70 = 0
77-7*m = 0 // - 77
-7*m = -77 // : -7
m = -77/(-7)
m = 11
m = 11
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