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m in (-oo:+oo)
m/3+4 = 7/8 // - 7/8
m/3-(7/8)+4 = 0
m/3-7/8+4 = 0
1/3*m+25/8 = 0 // - 25/8
1/3*m = -25/8 // : 1/3
m = -25/8/1/3
m = -75/8
m = -75/8
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