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m in (-oo:+oo)
2*m-(7*m)+7 = -43 // + 43
2*m-(7*m)+7+43 = 0
2*m-7*m+7+43 = 0
50-5*m = 0 // - 50
-5*m = -50 // : -5
m = -50/(-5)
m = 10
m = 10
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