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m in (-oo:+oo)
4*(5*m+6) = 84 // - 84
4*(5*m+6)-84 = 0
4*(5*m+6)-84 = 0
20*m-60 = 0
20*m-60 = 0
20*m-60 = 0 // + 60
20*m = 60 // : 20
m = 60/20
m = 3
m = 3
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