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c in (-oo:+oo)
(1/4)*c+2/7 = (2/7)*(c+1)-((1/28)*c) // - (2/7)*(c+1)-((1/28)*c)
(1/4)*c-((2/7)*(c+1))+(1/28)*c+2/7 = 0
(-2/7)*(c+1)+(1/4)*c+(1/28)*c+2/7 = 0
c/4-2/7*(c+1)+c/28+2/7 = 0
(-2/7*4*7*28*(c+1))/(4*7*28)+(7*28*c)/(4*7*28)+(4*7*c)/(4*7*28)+(2*4*28)/(4*7*28) = 0
7*28*c-2/7*4*7*28*(c+1)+4*7*c+2*4*28 = 0
28*c-28*c-224+224 = 0
224-224 = 0
0 = 0
0/(4*7*28) = 0
0/(4*7*28) = 0 // * 4*7*28
0 = 0
c belongs to the empty set
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