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m in (-oo:+oo)
4*(7*m-7) = 168 // - 168
4*(7*m-7)-168 = 0
4*(7*m-7)-168 = 0
28*m-196 = 0
28*m-196 = 0
28*m-196 = 0 // + 196
28*m = 196 // : 28
m = 196/28
m = 7
m = 7
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