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m in (-oo:+oo)
m/28-4.9 = -7.11 // + 7.11
m/28-4.9+7.11 = 0
1/28*m+2.21 = 0 // - 2.21
1/28*m = -2.21 // : 1/28
m = -2.21/1/28
m = -61.87999257
m = -61.87999257
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