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m in (-oo:+oo)
(1/4)*m = 21.7 // - 21.7
(1/4)*m-21.7 = 0
1/4*m-21.7 = 0 // + 21.7
1/4*m = 21.7 // : 1/4
m = 21.7/1/4
m = 86.8
m = 86.8
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