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m in (-oo:+oo)
-33 = 7*m+3*m-3 // - 7*m+3*m-3
3-(7*m)-(3*m)-33 = 0
3-7*m-3*m-33 = 0
-10*m-30 = 0 // + 30
-10*m = 30 // : -10
m = 30/(-10)
m = -3
m = -3
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