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m in (-oo:+oo)
2*(9-4*m) = -70 // + 70
2*(9-4*m)+70 = 0
2*(9-4*m)+70 = 0
88-8*m = 0
88-8*m = 0
88-8*m = 0 // - 88
-8*m = -88 // : -8
m = -88/(-8)
m = 11
m = 11
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