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m in (-oo:+oo)
2*m+2 = 68-4*m // - 68-4*m
2*m-(-4*m)-68+2 = 0
2*m+4*m-68+2 = 0
6*m-66 = 0 // + 66
6*m = 66 // : 6
m = 66/6
m = 11
m = 11
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