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m in (-oo:+oo)
(m+4)/7 = 10+20 // - 10+20
(m+4)/7-20-10 = 0
(m+4)/7+(-20*7)/7+(-10*7)/7 = 0
m-20*7-10*7+4 = 0
m-136-70 = 0
m-206 = 0
(m-206)/7 = 0
(m-206)/7 = 0 // * 7
m-206 = 0
m-206 = 0 // + 206
m = 206
m = 206
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