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m in (-oo:+oo)
7*m+2 = 98-5*m // - 98-5*m
7*m-(-5*m)-98+2 = 0
7*m+5*m-98+2 = 0
12*m-96 = 0 // + 96
12*m = 96 // : 12
m = 96/12
m = 8
m = 8
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