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m in (-oo:+oo)
2*m+7 = 28-5*m // - 28-5*m
2*m-(-5*m)-28+7 = 0
2*m+5*m-28+7 = 0
7*m-21 = 0 // + 21
7*m = 21 // : 7
m = 21/7
m = 3
m = 3
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