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m in (-oo:+oo)
7*m-2/3 = 187/3 // - 187/3
7*m-2/3-(187/3) = 0
7*m-2/3-187/3 = 0
7*m-63 = 0 // + 63
7*m = 63 // : 7
m = 63/7
m = 9
m = 9
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