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m in (-oo:+oo)
(2/3)*(m-30) = (2/3)*m+10 // - (2/3)*m+10
(2/3)*(m-30)-((2/3)*m)-10 = 0
(2/3)*(m-30)+(-2/3)*m-10 = 0
2/3*(m-30)+(-2*m)/3-10 = 0
(2/3*3*(m-30))/3+(-2*m)/3+(-10*3)/3 = 0
2/3*3*(m-30)-2*m-10*3 = 0
-60-30 = 0
-90 = 0
-90/3 = 0
-90/3 = 0 // * 3
-90 = 0
m belongs to the empty set
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