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m in (-oo:+oo)
7*(6*m+3) = 357 // - 357
7*(6*m+3)-357 = 0
7*(6*m+3)-357 = 0
42*m-336 = 0
42*m-336 = 0
42*m-336 = 0 // + 336
42*m = 336 // : 42
m = 336/42
m = 8
m = 8
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