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m in (-oo:+oo)
(-1/6)*m+(1/3)*m+2/7 = 113/420 // - 113/420
(-1/6)*m+(1/3)*m+2/7-(113/420) = 0
(-1/6)*m+(1/3)*m+2/7-113/420 = 0
1/6*m+1/60 = 0 // - 1/60
1/6*m = -1/60 // : 1/6
m = -1/60/1/6
m = -1/10
m = -1/10
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