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-((2/5)*m)-8 = (1/2)*(M-7) // - (1/2)*(M-7)
-((1/2)*(M-7))-((2/5)*m)-8 = 0
(-1/2)*(M-7)+(-2/5)*m-8 = 0
(-2*m)/5-1/2*(M-7)-8 = 0
(-1/2*5*(M-7))/5+(-2*m)/5+(-8*5)/5 = 0
-1/2*5*(M-7)-2*m-8*5 = 0
35/2-5/2*M-2*m-40 = 0
-5/2*M-2*m-45/2 = 0
(-5/2*M-2*m-45/2)/5 = 0
(-5/2*M-2*m-45/2)/5 = 0 // * 5
-5/2*M-2*m-45/2 = 0
x belongs to the empty set
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