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m in (-oo:+oo)
4*m+3 = 84-5*m // - 84-5*m
4*m-(-5*m)-84+3 = 0
4*m+5*m-84+3 = 0
9*m-81 = 0 // + 81
9*m = 81 // : 9
m = 81/9
m = 9
m = 9
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